Question: what are the causes of bad blood circulation?
Answer: Peripheral artery disease. Peripheral artery disease (PAD) can lead to poor circulation in your legs. ... 
Blood clots. Blood clots block the flow of blood, either partially or entirely. ... 
Varicose veins. Varicose veins are enlarged veins caused by valve failure. ... 
Diabetes. ... 
Obesity. ... 
Raynaud's disease.