Harvard Health Content API

There are several types of "sun allergies," including polymorphous light eruption (PMLE), hives, and photoallergic reactions. Learn about these different reactions to sun exposure, as well as prevention and treatment.

As discussion and debate continues on mass shootings there is increasing evidence that growing up amidst this violence and other extreme stressors affect developing brains and bodies in ways that can be permanent.

Active surveillance allows men with low- or intermediate-risk prostate cancer to avoid temporarily the side effects of invasive therapies, but men often feel anxious about their cancer. Emerging evidence suggests there may be a middle path between no treatment and aggressive therapies.

Sleep is important for your memory, as the brain uses the time you are sleeping to process new information and consolidate it for later recall. If you are tired from a lack of sleep, it’s more difficult to pay attention, and attention is necessary to good memory function.

Women are more likely to get acne after age 20 than men. Unfortunately, treatment options that worked in the teenage years may not work as well in adult females. The emotional toll of acne may include a higher risk of developing depression, and having severe acne can negatively affect quality of life.

There is no way to prepare for the many shades of grief, which can lead to illness as well as distress. While each person navigates grief differently, the experience of others and broad advice on how to cope may offer comfort.