Chest pain is a common symptom of many heart diseases such as coronary artery disease, angina, and heart attack. According to the Centers for Disease Control and Prevention (CDC), heart disease is the leading cause of death in the United States. If you experience chest pain, seek immediate medical attention.

Shortness of breath can be a symptom of various diseases, including asthma, chronic obstructive pulmonary disease (COPD), and pneumonia. It can also be a sign of a heart attack, pulmonary embolism, or anaphylaxis. If you have trouble breathing, seek medical attention right away.

Headaches are common and usually harmless. However, a sudden and severe headache can be a symptom of a stroke or brain aneurysm. According to the National Institute of Neurological Disorders and Stroke, about 80% of people who experience a stroke have a severe headache.

Vision changes, such as blurry vision, double vision, and loss of vision, can be a symptom of various diseases, including stroke, diabetes, and multiple sclerosis. If you experience sudden vision changes, seek immediate medical attention.

Unexplained weight loss can be a sign of many diseases, including cancer, hyperthyroidism, and celiac disease. According to a study published in the American Family Physician Journal, unexplained weight loss is a red flag for cancer in older adults.

Fatigue is a common symptom of many diseases, including depression, anemia, and thyroid disorders. It can also be a sign of heart disease. Seek medical attention if you feel fatigued for an extended period.

Skin changes, such as moles that change shape or color, can be a sign of skin cancer. According to the American Cancer Society, skin cancer is the most common cancer in the United States. Seek medical attention if you notice any skin changes.

Mood changes, such as depression and anxiety, can be symptoms of mental health disorders. They can also be a sign of hormonal imbalances, thyroid disorders, and other medical conditions. Seek medical attention if you experience persistent mood changes.

A high fever can be a sign of an infection or other medical condition. Seek medical attention if you have a fever higher than 103 degrees Fahrenheit.