The five causes of bruising: 1. Blood thinning medications 2. Low calcium (can come from gastric bypass, low vitamin D, or calcium channel blockers) 3. Low vitamin K1 (can come from malabsorption, low bile, liver or kidney problems, or antibiotics) 4. Low vitamin C (vitamin C helps keep the capillaries strong) 5. Low platelets (can come from low vitamin B12, low folate, and certain medications)
