(StatePoint) Blood clots affect 900,000 people in the U.S. each year. One in five blood clots are related to cancer and its treatment. Blood clots that form in a person’s legs or arms can be dangerous, and those that break off and travel to the lungs can be life-threatening.Among people with cancer, survival rates are lower for people who also have blood clots. The risk of a blood clot is greatest in the first few months after a cancer diagnosis, when treatment generally occurs.Click Here to Enlarge Infographic.Contact your cancer doctor if you experience any of the signs or symptoms of a blood clot in the arm or leg, which include: swelling, pain or tenderness not caused by an injury, skin that is warm to the touch, and redness or discoloration of the skin. Seek immediate medical attention if you experience any of the signs or symptoms of a blood clot in the lung, which include: difficulty breathing, chest pain that worsens with a deep breath or cough, coughing up blood, and a faster than normal or irregular heartbeat.  Learn more at stoptheclot.org/spreadtheword.If you have cancer and are undergoing cancer treatment, protect your health by learning about your risk for life-threatening blood clots.Cancer and Blood Clots: How to Protect Your Health