What causes tingling numbness I legs, knees and feet? Alsobottom of feet ache. Left worse than right. I do have bursitis in hips and C7 herniated disc

Many possible causes. There are many possible causes of numbness in your legs and feet. I know nothing of your health but diabetes can cause this, vitamin B12 deficiency, herniated disc issues, local nerve entrapment, or what is called idiopathic peripheral neuropathy. This warrants evaluation by your physician.