What would cause a burning sensation on the bottom of my foot?

Nerve inflammation,: Nerve damage or tissue irritation o the plantar fascia are all possibilities. Please discuss with a foot specialist and your primary care doc.

Nerves: Most burning type of pain is caused by a nerve problem. Depending on the location of the pain on the bottom of the foot it may be caused by plantar fasciitis entrapping the nerve at the side & bottom of the heel. If at the level of the toes it could be a neuroma. If you are a diabetic it could be neuropathy. If it persists you need to see someone.