One cause of petechiae is straining too much for too long. For instance, a long coughing fit or an overemotional bout of crying can lead to petechiae. You can also get petechiae from vomiting or straining while lifting weights. It's also a common symptom to have after you've given birth. Certain medications can be the cause of petechiae. For instance, anticoagulants such as warfarin and heparin can cause petechiae. Similarly, drugs in the naproxen family, such as Aleve, Anaprox, and Naprosyn can also cause petechiae.  A few other drugs that can cause petechiae include quinine, penicillin, nitrofurantoin, carbamazepine, desipramine, indomethacin, and atropine.  If you think one of your medications is causing petechiae, talk to your doctor. She can evaluate whether you need to be on that particular medicine or whether you can switch to something else. Specific infectious diseases can also lead to this problem. Anything from a bacterial infection to a fungal infection can cause petechiae, such as mononucleosis, scarlet fever, strep throat, meningococcemia, as well as a number of less common infectious organisms. Petechiae can also be a symptom of other diseases that disrupt appropriate blood clotting, such as leukemia and other bone marrow cancers. It can also be the result of a vitamin c deficiency (also known as scurvy) or a vitamin k deficiency, as both are required for proper blood clotting. It's worth noting that some treatments, such as chemotherapy, can also result in petechiae. This disease causes you to have clotting problems. It does so by taking away some of your platelets, which are found in your blood. Doctors do not know the exact mechanism by which this occurs, hence the term "idiopathic" (a word that indicates the cause is unknown). This disease can lead to petechiae and purpura because platelets usually work to plug up any small tears in your blood vessels. When you don't have enough platelets, your blood can't repair vessels properly, leading to bleeding underneath the skin. That can cause small red spots, petechiae, or larger blood spots, called purpura.
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