Menstruation (or period) happens monthly. As the uterus sheds its lining, vaginal bleeding follows. Menstrual blood is made of blood and tissue.| medlineplus.gov
Opioid use disorder (OUD) a serious public health problem in the U.S. Learn about opioids, how they affect the body, and what OUD is.| medlineplus.gov
Over-the-counter (OTC) pain relievers can help relieve pain or lower a fever. Over-the-counter means you can buy these medicines without a prescription.| medlineplus.gov
Nearly everyone has had a headache, the most common form of pain. Learn the different types, the different symptoms of, and when to see a doctor.| medlineplus.gov
You call it barfing, puking, or throwing up; your doctor calls it vomiting. Read more about nausea and vomiting and the conditions that cause them.| medlineplus.gov
Read about causes, symptoms and treatments associated with stress, something that most people encounter from time to time.| medlineplus.gov
Pain is a feeling triggered in the nervous system. You may feel it as a prick, tingle, sting, burn, or ache. Read about the causes and what can help.| medlineplus.gov