Heart and Vascular Health Thoracic Outlet Syndrome: Symptoms and Causes By Heart and Vascular Institute, August 22, 2016 Many health conditions can cause pain and other symptoms in your arms and hands, from minor muscle strains to a serious problem like a heart attack. Thoracic outlet syndrome (TOS), a group of conditions that can put pressure on the arteries, veins, and nerves in your upper chest, can cause symptoms like pain, coldness, and numbness in your arm and hand. While this condition is not life-threatening, it can lead to complications if left untreated. Find out about the types and symptoms of TOS, who is at risk, and how to tell if your arm pain is a sign of a more serious health problem. Thoracic outlet syndrome is not one but a group of conditions that can lead to #heartproblems. Click To Tweet Types of Thoracic Outlet Syndrome Your thoracic outlet is the area of your upper chest behind below your collarbone, opposite your first rib. TOS can affect the arteries, veins, or nerves in this area. There are three types of this condition, including: Arterial thoracic outlet syndrome Venous thoracic outlet syndrome Neurogenic thoracic outlet syndrome Arterial thoracic outlet syndrome Arterial thoracic outlet syndrome affects the artery that brings blood to your arm, and is usually caused by an abnormal or extra first rib. Symptoms can include: Pain, coldness, or paleness or change of color in the hand Cramping when using your arm Arterial TOS can be treated, usually through surgery to fix your artery and to safely remove your rib, if necessary. If left untreated, arterial TOS can lead to serious complications, including: An aneurysm, or weak spot or bulge in your artery. Over time, the aneurysm can burst, causing life-threatening internal bleeding. Blood clots, which can block the flow of blood to your hands and fingers. Venous thoracic outlet syndrome Venous thoracic outlet syndrome affects the vein that brings blood from your arm back to your heart and may be caused by repeated use of your shoulder. Symptoms can include: Swelling and dark coloring in the arm Arm pain A feeling of heaviness or fullness in the arm Dilated chest wall veins Depending on your specific condition, venous TOS may be treated with: Blood thinner medicines Thrombolysis, a procedure that sends medicine directly into your vein to break up a blood clot Venoplasty, which uses a catheter and balloon to open up your vein Surgery to remove blood clots, open up your vein, or decompress your thoracic outlet If left untreated, venous TOS can lead to blood clots, including pulmonary embolism, a potentially life-threatening blood clot in your lungs. Neurogenic thoracic outlet syndrome Neurogenic TOS affects the nerves that bring feeling to your arm and control the muscles in your shoulder, elbow, wrist, and hand. This type of TOS usually happens because of a previous injury or trauma, or repeated motions. Symptoms can include: Pain, numbness, tingling, or weakness in your arm and hand Pain that starts in your shoulder and moves down your arm into your fingertips Tired feeling in your arm Neck pain Headaches at the back of your head Treatment for neurogenic TOS may include physical therapy and medicines to reduce inflammation. If your neurogenic TOS does not improve with these treatments, you may need surgery to relieve the compression on your brachial plexus. Who Is at Risk for TOS? TOS affects both men and women, and can happen at any age. Some risk factors can include: Playing a sport with repetitive motions, like swimming, volleyball, or baseball Stress from repetitive tasks A history of trauma to your cervical spine or neck Poor posture Is It Thoracic Outlet Syndrome or a Heart Attack? In some cases, TOS can cause pain that is similar to angina, or chest pains that happen from decreased blood flow to the heart muscle. If you think you or someone else is having a heart attack, call 911 right away. While TOS does not cause other symptoms like shortness of breath, nausea, dizziness, lightheadedness, sweating, and fatigue, it is always better to have a doctor examine you to rule out a heart attack. To learn more about thoracic outlet syndrome or to find a vascular surgeon to treat your condition, visit the UPMC Heart and Vascular Institute or call 412-802-3333.