Signs and symptoms of antiphospholipid syndrome can include: 
Blood clots in legs (DVT). Signs of a DVT include pain, swelling and redness. These clots can travel to the lungs (pulmonary embolism).
Repeated miscarriages or stillbirths. Other complications of pregnancy include dangerously high blood pressure (preeclampsia) and premature delivery.
Stroke. A stroke can occur in a young person who has antiphospholipid syndrome but no known risk factors for cardiovascular diseases.
Transient ischemic attack (TIA). Similar to a stroke, a TIA usually lasts only a few minutes and causes no permanent damage.
Rash. Some people develop a red rash with a lacy, net-like pattern.
 Less common signs and symptoms include: 
Neurological symptoms. Chronic headaches, including migraines; dementia and seizures are possible when a blood clot blocks blood flow to parts of the brain.
Cardiovascular disease. Antiphospholipid syndrome can damage heart valves.
Low blood platelet counts (thrombocytopenia). This decrease in blood cells needed for clotting can cause episodes of bleeding, particularly from the nose and gums. Bleeding into the skin will appear as patches of small red spots.
