Alcohol can make you feel anxious or irritable the next day. We asked experts what causes this — and how to manage it.

While drug-induced mystical experiences can have benefits, research suggests they may not be enough to create lasting change.

Between four and 10 million people in the U.S. have fibromyalgia. Many doctors look askance at the disorder, leading some patients to seek pain relief from substance use.

People “hum into their phones, gargle with theatrical enthusiasm, dunk their faces into bowls of ice water, and poke at their ...

A Mayo Clinic study found that a single 25 mg dose of a combination of amphetamine-dextroamphetamine salts (Adderall) can have measurable cardiovascular effects in healthy young adults.