Anti-cardiolipin antibodies are the body’s own production of antibodies to platelets and negatively charged cardiolipin in the internal belt, which are a type of faulty antibody. This condition often produces a hypercoagulable state in the body and leads to thrombosis. High anti-cardiolipin antibodies are mainly seen in: first, autoimmune diseases such as systemic lupus erythematosus, rheumatoid arthritis and scleroderma. Second, high anti-cardiolipin antibodies are also seen in viral infections, such as chickenpox virus, adenovirus, or mumps virus. Third, high anti-cardiolipin antibodies are seen in mycoplasma infections. Fourth, high anti-cardiolipin antibodies are also seen after the application of certain drugs, such as chlorpromazine. Fifth, high anti-cardiolipin antibodies can also be seen in 2% of normal people, especially in the elderly.