Severe foot pain in people with diabetes is often due to diabetic neuropathy (nerve damage from long-term high sugar levels). It can cause burning, stabbing, or tingling pain, especially at night. Other possible reasons include poor blood circulation, vitamin B12 deficiency, foot infections, or muscle/joint problems. Gemer and Telday usually do not directly cause foot pain, but uncontrolled sugar levels can. It is important to check your blood sugar control, examine your feet regularly, and consult your doctor; early treatment can prevent complications.