Blood in the urine. When it appears in the urine, blood can be a warning sign of a urinary tract problem. Kidney or bladder cancer can cause this symptom, but it can also be due to infection, kidney stones, or kidney disease.
The cough does not go away. Colds and the flu can make you tear up, but they’re also signs of lung cancer, along with red flags like chest pain, weight loss, hoarseness, fatigue, and shortness of breath. If you can’t shake it, see your doctor, especially if you smoke.