Unexplained weight loss. If you are losing weight without trying, it could be a sign of a serious health condition, such as cancer, diabetes, or hyperthyroidism.
Fatigue. Feeling tired all the time, even after getting a good night's sleep, can be a sign of anemia, depression, or chronic fatigue syndrome.
Chest pain. Chest pain can be a sign of heart disease, but it can also be caused by other conditions, such as anxiety or indigestion.
Shortness of breath. Shortness of breath can be a sign of heart disease, lung disease, or anemia.
Persistent cough. A cough that lasts for more than 8 weeks could be a sign of chronic obstructive pulmonary disease (COPD), asthma, or lung cancer.
Changes in bowel habits. If you have diarrhea, constipation, or unexplained weight loss, it could be a sign of a digestive problem, such as irritable bowel syndrome (IBS) or colon cancer.
Pain in the joints or muscles. Pain in the joints or muscles can be a sign of arthritis, gout, or other conditions.