The common causes of high anticardiolipin antibodies in pregnancy include autoimmune diseases, viral infections, and drug effects, etc., which should be investigated in time. 1. Autoimmune diseases: Anti-cardiolipin antibody is an autoimmune antibody, if the antibody is abnormally high, it may be the patient’s own immune system problems, can not be ruled out is caused by systemic lupus erythematosus, rheumatoid arthritis, or other immune diseases, you need to be guided by a doctor to determine the cause of further examination. 2. Viral infections: high anticardiolipin antibodies may also be caused by viral infections, common viruses include chickenpox virus, rubella virus and mumps virus, which can cause high anticardiolipin antibodies, and you need to go to the hospital for further examination to determine the cause of the disease. 3. Drugs: high anticardiolipin antibodies can also be caused by drugs, such as chlorpromazine, phenothiazine and other drugs, which may lead to high antibodies. If you have high anticardiolipin antibodies, you must go to the hospital for treatment to identify the specific cause.