<s>[INST] Hi, i fell about 5 days ago at cheer leading practice on my knee/ shin and now i have a huge bruise on my shin/knee it is also very swollen.. The first time this happened was about a year ago and has happened about 5 times since then.. I and every time the bruising is pretty severe and spreads all the way down my leg.. I went to the doctor the first time and he said i had a bone bruise.. I was just wondering if its normal for it to keep happening.. I only went to the doctor about it the first time.. Should i go again cause it keeps happening.. Could it be something about my blood? [/INST] Hello, Thanks for posting your query. Bruises can happen due to-1.) People platelet and blood coagulation disorders can bruise easily.2.) Being deficient in vitamin C, your more prone to bruise easily, due to weaker blood vessels.3.) Rare genetic disorder called on Hildebrand disease, which prevents the blood from clotting properly. This disorder affects at least 1% of the population.4.) Bruises in elderly people may be due to thinning of the skin.5.) Medications6.) Maybe you just hit something harder than you expected.7.) Heavy and rigorous exercise may cause bruises, which results from microscopic tears in blood vessels underneath the skin. Visit your doctor for further investigation and treatment plan according to it. Regards. </s>