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.\nWhile this condition is not life-threatening, it can lead to complications if left untreated.\u00a0Find 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.\nThoracic outlet syndrome is not one but a group of conditions that can lead to #heartproblems. Click To Tweet\nTypes of Thoracic Outlet Syndrome\nYour 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:\n\nArterial thoracic outlet syndrome\nVenous thoracic outlet syndrome\nNeurogenic thoracic outlet syndrome\n\nArterial thoracic outlet syndrome\nArterial 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:\n\nPain, coldness, or paleness or change of color in the hand\nCramping when using your arm\n\nArterial 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:\n\nAn aneurysm, or weak spot or bulge in your artery. Over time, the aneurysm can burst, causing life-threatening internal bleeding.\nBlood clots, which can block the flow of blood to your hands and fingers.\n\nVenous thoracic outlet syndrome\nVenous 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:\n\nSwelling and dark coloring in the arm\nArm pain\nA feeling of heaviness or fullness in the arm\nDilated chest wall veins\n\nDepending on your specific condition, venous TOS may be treated with:\n\nBlood thinner medicines\nThrombolysis, a procedure that sends medicine directly into your vein to break up a blood clot\nVenoplasty, which uses a catheter and balloon to open up your vein\nSurgery to remove blood clots, open up your vein, or decompress your thoracic outlet\n\nIf left untreated, venous TOS can lead to blood clots, including pulmonary embolism, a potentially life-threatening blood clot in your lungs.\nNeurogenic thoracic outlet syndrome\nNeurogenic 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:\n\nPain, numbness, tingling, or weakness in your arm and hand\nPain that starts in your shoulder and moves down your arm into your fingertips\nTired feeling in your arm\nNeck pain\nHeadaches at the back of your head\n\nTreatment 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.\nWho Is at Risk for TOS?\nTOS affects both men and women, and can happen at any age. Some risk factors can include:\n\nPlaying a sport with repetitive motions, like swimming, volleyball, or baseball\nStress from repetitive tasks\nA history of trauma to your cervical spine or neck\nPoor posture\n\nIs It Thoracic Outlet Syndrome or a Heart Attack?\nIn 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.\nWhile 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\u00a0rule out a heart attack.\nTo 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.