Learn about infertility in women, including possible causes, what tests might be needed and fertility treatments available to help with getting pregnant.
Disease
Food poisoning (foodborne illness)
Learn more about illnesses that can cause upset stomach, vomiting and diarrhea within hours of eating tainted food.
Disease
Giardia infection (giardiasis)
This type of infection can cause stomach cramps, upset stomach and loose stools. Find out how to treat and prevent this waterborne parasite.
Disease
HPV infection
This common viral infection often gets better on its own. When it doesn't, it can cause warts and even lead to some cancers.
Disease
Hamstring injury
Self-care measures, such as rest and ice, might be all that's needed for an injury to one of the hamstring muscles.
Disease
Helicobacter pylori (H. pylori) infection
Learn more about the symptoms, tests and treatments for this infection.
Disease
Idiopathic hypersomnia
Learn about this sleep condition that causes extreme sleepiness during the day and trouble waking up from sleep.
Disease
IgA nephropathy (Berger disease)
This disease causes kidney inflammation that, over time, can interfere with the kidneys' ability to filter waste from the blood.
Disease
Illness anxiety disorder
Excessive worry that you're seriously ill based on minor symptoms can result in major emotional distress and disrupt your life. Also called hypochondria.
Disease
Immune thrombocytopenia (ITP)
Caused by low levels of platelets, symptoms may include purple bruises called purpura, as well as tiny reddish-purple dots that look like a rash.
Disease
Impacted wisdom teeth
These teeth don't have enough room to come in or develop properly, leading to pain, damage to other teeth and other dental problems.
Disease
Impetigo
Learn about the symptoms, causes and treatment of this highly contagious bacterial skin infection common in infants and young children.