Sometimes get severe hip (back of hip bone)pain when walking.what could it be?should i do vit d and calcium tests?coz i never drink milk or dairy

Biomechanics : There are a number of possible diagnosis. A biomedical possibility would consist of a functional or structural limb length difference causing pain in the sacral- iliac joint when walking or running. Symptoms with this diagnosis can be produced elsewhere. Have a physical therapist or podiatrist measure your anatomy or MD or DO knowledgeable in biomechanics. Treatment ,lift with/without orthotic