Symptom Checker Check on one or more symptoms to find possible causes. About this Symptom Checker.

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

Symptom Checker Find out what could be causing your symptoms and when to seek care.

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Oct 9, 2023 · Some heart attacks strike suddenly. But many people have warning signs and symptoms hours, days or weeks in advance. Chest pain or pressure (angina) that keeps happening and doesn't …

Aug 13, 2024 · Learn about symptoms, causes and treatment of cardiovascular disease, a term describing a wide range of conditions that can affect the heart.

Feb 1, 2025 · 7 signs and symptoms not to ignore From unexplained weight loss to sudden flashes of light, take note of important symptoms, and know when to seek medical care.

Dec 13, 2022 · Signs and symptoms of mental illness can vary, depending on the disorder, circumstances and other factors. Mental illness symptoms can affect emotions, thoughts and behaviors.

Sep 20, 2025 · Decreased vision. Symptoms may come on suddenly and get worse quickly. Though in some cases, they develop gradually. They may affect one or both eyes. Sometimes, there are no …

If you or a person you're taking care of has symptoms that worry you, get help. Let the healthcare team know about a positive test for COVID-19 or symptoms of the illness.