When a blood clot forms in a vein of the arm you may experience swelling, pain, discoloration or redness. Many times the area will feel warm to the touch. If it is an artery with a blood clot, the arm may feel cool from the inside and painful.
You can find more information here: emedicinehealth.com/blood_clots/page2_em....
A blood clot can cause swelling, inflammation and pain. However, in many cases, a blood clot may occur without any obvious symptoms. If the clot breaks off and travels to the lungs, this is known as a pulmonary embolism and can be life threatening.
This may produce shortness of breath, dizziness, confusion and severe pain. You can find more information here: nlm.nih.gov/medlineplus/ency/article/001....
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