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No one is truly allergic to the sun, but some people are quite sensitive to different types of sun rays and may develop mild to serious reactions after spending time in the sun.

There are several types of “sun allergies,” but polymorphous light eruption (PMLE), an autoimmune condition in the skin that occurs after sun exposure, is one of the most common. Other conditions considered as sun allergies are solar urticaria (hives and reddish patches that usually start 30 minutes to two hours after the sun exposure), actinic prurigo (papules and nodules that are intensely itchy on sun-exposed skin areas), and photoallergic reaction (when the UV rays from the sun modify the chemical structure of medications or products applied to the skin, and a person develops an allergy to the newly modified substance).

What causes PMLE?

People who have PMLE have immune cells that are triggered by sun rays, which attack their skin, and they develop a skin reaction to the sun’s the ultraviolet (UV) rays.

PMLE represents 70% of all sun-induced skin eruptions. It can affect both sexes and all skin types, and it usually starts when someone is a teen or young adult. PMLE may be an inherited condition. Being a female, having fair skin, and living in the north are other risk factors.

PMLE is more common in young women who live in temperate climates. People who live in temperate climates spend all winter out of the sun, so when it becomes warmer the sun exposure is intense. People who live in warmer climates are desensitized because they have a higher sun exposure all year.

What does PMLE look like?

PMLE can appear several hours or days after the first major sunlight exposure of the season, usually during spring or at the beginning of summer. The areas of the body generally affected the most are the ones that are covered during wintertime, but not in the summer: the neck, the chest, and the outer parts of the arms.

After exposure to the sun, people with PMLE usually notice reddish patches on their skin. These spots may itch, burn, or sting, but they typically don’t leave a scar. In more severe cases, the patches cover most of the body and may also be associated with headaches, fevers, tiredness, and low blood pressure. (If you experience these symptoms, see an urgent care provider for evaluation.) If you think you have PMLE or another sun allergy, a dermatologist is the best doctor to evaluate and treat your skin condition.

Does PMLE get better?

PMLE lesions often get better in approximately 10 days, and it’s important to avoid sun exposure until you are healed. People who develop PMLE can experience significant discomfort and have their life negatively impacted during the spring and summer months. However, repetitive sun exposure can make PMLE less likely to occur. The hardening effect, as it is called, means that the skin lesions that appear after the first episode are less severe, and they can be better tolerated during subsequent episodes.

What are current treatments for any sun allergy, including PMLE?

The best treatment is to prevent sun exposure. Avoid sunlight when it is most intense (from 10 a.m. to 4 p.m.), and use UV-protecting clothing or clothes made of darker and thicker fabrics, as they will prevent the UV rays coming from the sun from reaching your skin. Hats with a wide brim protect your scalp, face, and (partially) the neck.

Broad-spectrum sunscreens that protect your skin from both UVA and UVB rays should be used daily, even if it’s cloudy. Apply sunscreen on your face and any part of your skin that is not covered by a hat or clothing. Reapply sunscreen every two hours, and if you go swimming or get sweaty reapply more frequently (water-resistant sunscreen should also be reapplied).

If you develop PMLE, the areas of skin impacted can be treated with steroid creams. In severe cases, your doctor may recommend a short course of steroid pills. Medications that reduce the immune response, such as azathioprine, are options for treating PMLE, since it is an autoimmune condition (the body is attacking it is own healthy cells).

Antihistamines are medications typically used for allergies that may help shorten the duration of reddish patches that itch or burn, and they also reduce inflammation.

Hydroxychloroquine (a medication also used to treat malaria) can be used in case of flare-ups, or as a prevention method when people travel to sunny locations during winter vacations.

Oral Polypodium leucotomos extract, a natural substance derived from tropical fern leaves, may work as a potent antioxidant, and has anti-inflammatory properties that are beneficial in the prevention of PMLE. Other nutritional supplements containing lycopene and beta-carotene (vitamin A derivatives) have a similar effect. A dermatologist will guide you on the best way to use these medications.

The bottom line

Sun allergies are common in temperate climates, but with a dermatologist’s guidance, vigilant sun prevention, and medications they can be managed throughout the sunny months of the year.

About the Authors

Neera Nathan, MD, MSHS, Contributor

Dr. Neera Nathan is a dermatologist and researcher at Massachusetts General Hospital and Lahey Hospital and Medical Center. Her clinical and research interests include dermatologic surgery, cosmetic dermatology, and laser medicine. She is part of the … See Full Bio View all posts by Neera Nathan, MD, MSHS

Lais Lopes Almeida Gomes, Contributor

Dr. Lais Lopes Almeida Gomes is a dermatology research fellow at Massachusetts General Hospital, and a pediatric dermatologist in Brazil. Her clinical and research interests include atopic dermatitis and global health. She is part of the … See Full Bio View all posts by Lais Lopes Almeida Gomes

Chronic kidney disease (CKD) affects an estimated 37 million people in the United States. Often, it begins and progresses silently, causing no obvious symptoms until kidney function is severely impaired. During early stages, up to nine in 10 people aren’t aware that they have it.

If kidney disease is caught early and treated properly, serious problems may be avoided. Once kidneys fail, ongoing dialysis or kidney transplant is necessary. But barriers to care are highest for Black and Hispanic people with advanced kidney disease, and also for younger adults ages 22 to 44, according to a recent study.

How does kidney disease affect the body?

As a doctor who focuses on patients with kidney disease, I’ve found that it helps to explain a few basics. Our kidneys have several jobs. Their most important task is to regularly remove toxins from the bloodstream and excess water from the body by making urine.

If you have CKD, your kidneys are not removing toxins from your blood as well as they should. At its most severe, this can progress to end-stage kidney disease (ESKD), which is when the filtering capacity of your kidneys is reduced enough to make you feel ill.

If this occurs, two main forms of treatment can replace your kidney function: dialysis or a kidney transplant. Dialysis can be performed at a treatment center, or at home after appropriate training. Transplant surgery and post-surgical care occur at specialized centers.

What causes kidney disease?

High blood pressure, diabetes, and high cholesterol are three common risk factors for developing chronic kidney disease. Smoking, obesity, and frequent use of over-the-counter anti-inflammatory medicines, such as ibuprofen or naproxen, worsen kidney function over time.

Severe cases of COVID-19 requiring hospitalization have emerged as a separate risk factor for CKD. And genetic factors may predispose a person to kidney disease as well.

Gaps in kidney care are contributing to health disparities

Statistics show that people who are non-Hispanic Black, Hispanic, and Native American bear a disproportionate burden of kidney disease. For example:

• For every white person who develops ESKD, three Black people develop it.
• While non-Hispanic Black patients make up only 13% of the US population, they represent 35% of people currently on dialysis.
• Among patients initially on a wait list for a kidney transplant in 2014, median wait times were approximately 64 months for Black patients, 57 months for Hispanic patients, and 37 months for white patients.

Most likely, disparities in CKD reflect a combination of the social determinants of health, genetics, and a higher burden of other diseases that contribute to kidney disease, such as high blood pressure and diabetes. Barriers to getting proper treatment — particularly early treatment — play a role, too.

A recent retrospective study in the American Journal of Kidney Medicine suggests age is also a factor. The researchers reviewed data from more than 800,000 patients who received dialysis at home, dialysis at a treatment center, or a kidney transplant between 2011 and 2018. They found

• white people in the study were more likely than people of color to use at-home dialysis or receive a kidney transplant within 90 days.
• the care gap was greatest among adults ages 22 to 44. Black patients in this age group were 79% less likely, and Hispanic patients were 53% less likely, than white patients to receive a kidney transplant within 90 days.

These disparities may be driven partly by the fact that Black and Hispanic patients are less likely to receive appropriate early-stage kidney care, and by differences in insurance. They may also be less likely to have access to a living kidney donor. An important limitation of this study is that these findings cannot be applied to other minority groups.

The bottom line

The good news is that most people can prevent kidney disease by following healthy lifestyle habits, such as eating a low sodium diet, getting moderate exercise, not smoking, and minimizing alcohol intake. If you have high blood pressure, diabetes, high cholesterol, or heart disease, you should be tested for kidney disease once a year. High blood pressure and diabetes — which occur more often among Black Americans and people of color in the US than among white Americans — harm kidneys. Studies such as the one described above increase our understanding of health disparities in kidney disease, with the hope of one day coming up with an equitable solution for everyone, no matter their background or age.

About the Author

Christopher Estiverne, MD, Contributor

Originally from New Jersey, Dr. Christopher Estiverne is currently a staff nephrologist at Brigham and Women’s Hospital in Boston, where he specializes in care of patients with chronic kidney disease. He completed his medical degree and … See Full Bio View all posts by Christopher Estiverne, MD

If you’ve ever struggled with low back pain, you know that it can be surprisingly debilitating, even if the discomfort is short-term. You may find it difficult to grocery shop, do housework, play sports, or even tie your shoelaces. When back pain is chronic, lasting 12 weeks or longer, it can impair quality of life and physical function, and contribute to or worsen stress, anxiety, and depression.

While people dealing with chronic back pain are often directed to physical therapy, research shows that psychological approaches that teach strategies to manage your experience of pain can help. So, would combining these approaches do more to ease the pain? A recent systematic review of multiple studies suggests that it might.

How big is this problem, and what did this study find?

Worldwide, low back pain is a leading cause of disability and affects more than 560 million people. In the US, four in 10 people surveyed in 2019 had experienced low back pain within the past three months, according to the Centers for Disease Control and Prevention.

Published in TheBMJ, the review drew on 97 studies of adults experiencing chronic, nonspecific low back pain, with or without leg pain. Using statistical modeling, the researchers compared the effectiveness of therapies aimed at improving

• physical function, such as standing, climbing stairs, and managing personal care
• fear avoidance, because fear of pain can lead people to avoid movement, which contributes to the cycle of muscle weakening and further pain
• pain intensity, measured by pain scores from validated rating scales.

The review revealed that physical therapy plus psychological approaches, such as pain education and cognitive behavioral therapy, more effectively improved chronic low back pain than physical therapy alone. More specifically:

• For improving physical function and fear avoidance, pain education programs in conjunction with physical therapy offered the most sustained effects.
• For improving pain intensity, behavioral therapy combined with physical therapy offered the longest-lasting benefits.

The study shows the advantages of an interdisciplinary approach to chronic low back pain. Integrating behavioral therapy and physical therapy helped people achieve better function, reduce the cycle of avoidant behavior, and reduce the intensity of their pain. In their daily lives, this may lead to more productive workdays and better sleep, as well as enabling people to participate in more social activities, which boosts overall well-being.

What else should you know about this study?

The authors define chronic, nonspecific low back pain as pain between the bottom of the rib cage and buttocks crease, without an identified structural cause like spinal stenosis, cancer, or fracture.

However, “nonspecific” is a controversial term. Many experts on back pain believe that further evaluation might determine specific, multiple factors that contribute to pain.

A physiatrist, also known as a physical medicine and rehabilitation physician, can diagnose a range of pain conditions and help people navigate therapies to manage back pain.

In addition, the authors noted that the reporting of socioeconomic and demographic information was poor and inconsistent across the included studies. This means that the findings of the study may not apply to everyone.

How do psychological therapies help with pain?

Psychological therapies can help people reframe negative thoughts and change pain perception, attitudes, and behaviors. Examples of approaches that aim to reduce pain-related distress are cognitive behavioral therapy (CBT), acceptance and commitment therapy (ACT), mindfulness-based stress reduction (MBSR), biofeedback, and pain reprocessing therapy (PRT). A recent study evaluating PRT showed that psychological treatment focused on changing beliefs about the causes and consequences of chronic low back pain may provide substantial, long-lasting pain relief.

Neuroscience has demonstrated that the brain and body are always connected, and pain is a combination of medical, cognitive, emotional, and environmental issues. Strategies to manage pain effectively must address your body and brain by integrating physical and psychological therapies, such as with functional restoration programs and working with a pain psychologist. Gaining a better understanding of pain, and treating all factors contributing to your chronic pain, can be empowering and healing.

Follow me on Twitter @DanielleSarnoMD

About the Author

Danielle L. Sarno, MD, Contributor

Dr. Danielle Sarno is the director of interventional pain management in the department of neurosurgery at Brigham and Women’s Hospital, and an instructor of physical medicine and rehabilitation at Harvard Medical School. She is the founding … See Full Bio View all posts by Danielle L. Sarno, MD

It’s happened to so many people who menstruate: you’re going about your life until you realize that you just got your period. The ungainly scramble to find a restroom and the fervent prayer that you packed a menstrual product leaves you feeling anxious, vulnerable, and exposed. This is compounded by the fact that our society stigmatizes menstruation — or really, anything to do with a uterus — and a taboo hangs over these discussions.

This scenario is far worse if you are one of the nearly 22 million women living in poverty in the US who cannot afford menstrual hygiene products, a problem known as period poverty. One study in Obstetrics & Gynecology demonstrated that 64% of women reported ever having difficulty affording menstrual products, such as pads, tampons, or reusable products like menstrual cups. And 21% reported that they were unable to afford these products every month. People who are homeless or incarcerated are at particularly high risk of not having access to adequate menstrual hygiene products.

Why are period products a luxury?

Menstruating is a basic fact of human existence. Menstrual hygiene products are necessities, not luxuries, and should be treated as such. Unfortunately, food stamps and subsidies under the WIC (women, infants, and children) program that help with groceries do not cover menstrual products.

I have had patients tell me that they use toilet paper or paper towels instead of pads or tampons because they cannot afford menstrual products. People with heavy periods requiring frequent changes of these products particularly face financial challenges, as they must buy even more pads or tampons than the average menstruating person. If they try to extend the life of products by using them for multiple hours at a time, they can wind up with vulvar irritation and vaginal discomfort. They may also be at greater risk for toxic shock syndrome, a life-threatening infection.

Why is it important to talk about stigma around periods?

We need to address stigma around menstruation in order to understand and fix the challenges people face around access to menstrual hygiene products. Period poverty is real. Period equity should be real, too. Embarrassment or taboos may prevent people from advocating for themselves, but if that stigma is removed — or even eased by talking through these issues — we as a society can move forward to address the needs of half of our population. There is no equity when half the population bears the financial and physical distress as a consequence of the reproductive cycle needed to ensure human survival.

How can we address period poverty?

There are simple solutions to period poverty. The first is to eliminate the tax on menstrual products. Think about it: just as food, a necessity for all of us, is not taxed, menstrual products should not be taxed. Products that are reusable, such as menstrual cups or underwear, should be subsidized, and their use encouraged, to eliminate excess waste from individually wrapped pads and tampons. If these products are publicized, promoted, and affordable, more women may opt for them. Pads and tampons should be available free of charge in schools and federal buildings (note: automatic download).

Finally, you can take action: write to or call your legislators! There is a fantastic bill, Menstrual Equity For All Act of 2019, sponsored by Representative Grace Meng, that was introduced on March 26, 2019, but never received a vote. There is no good reason why this bill, which would allow homeless people, incarcerated people, students, and federal employees free access to menstrual hygiene products, was never even brought forward for a vote. We live in one of the world’s wealthiest countries, and lack of menstrual hygiene products should never impact someone’s ability to work or go to school. It’s time to stop treating people with a uterus as second-class citizens.

About the Author

Huma Farid, MD, Contributor

Dr. Huma Farid is an obstetrician/gynecologist at Beth Israel Deaconess Medical Center, and an instructor in obstetrics and gynecology at Harvard Medical School. She directs the resident colposcopy clinic and is the associate program director for the obstetrics and … See Full Bio View all posts by Huma Farid, MD