PSA tests can detect elevated levels of prostate-specific antigen in the blood, which are sometimes a sign of prostate cancer. And complete blood counts — or CBCs — can show high or low levels of certain blood components, which are sometimes a symptom of certain blood cancers.  

But are there any simple blood tests available that can prove you have cancer? 

Adriana Maria Knopfelmacher Couchonal, M.D., a specialist...

Hematemesis is the scientific term for vomiting blood. But it’s not the same thing as hemoptysis, which is coughing up blood. The difference between these terms lies in the blood’s source. 

Hematemesis comes from somewhere along the digestive tract.  Hemoptysis originates in the lungs or the airway.  

So, what conditions other than cancer can cause this alarming symptom? And when should you see a doctor about...