May 11, 2023 · Having too few healthy red blood cells causes tiredness and weakness. There are many types of this condition.

Jan 31, 2024 · Borderline personality disorder usually begins by early adulthood. The condition is most serious in young adulthood. Mood swings, anger and impulsiveness often get better with …

Gastroesophageal reflux disease happens when stomach acid flows back up into the esophagus and causes heartburn. It's often called GERD for short. This backwash is known as acid reflux, …

Apr 9, 2025 · Rheumatoid arthritis is an ongoing, called chronic, condition that causes pain, swelling and irritation, called inflammation, in the joints. But it also can damage other parts of …

Mar 8, 2024 · Atrial fibrillation (AFib) is an irregular and often very rapid heart rhythm. An irregular heart rhythm is called an arrhythmia. AFib can lead to blood clots in the heart. The condition …

Apr 6, 2023 · A narcissistic personality disorder causes problems in many areas of life, such as relationships, work, school or financial matters. People with narcissistic personality disorder …

Oct 21, 2022 · Lupus is a disease that occurs when your body's immune system attacks your own tissues and organs (autoimmune disease). Inflammation caused by lupus can affect many …

Feb 28, 2024 · Checking your blood pressure helps you avoid health problems. Learn more about what your numbers mean.

Apr 24, 2025 · The symptoms of tuberculosis are similar to symptoms of many different illnesses. See your healthcare professional if you have symptoms that don't improve with a few days of …

Find possible causes of symptoms in children and adults. See our Symptom Checker.