Severe foot pain in my left foot on the left side of my foot. What do I do?

Plantar fasciitis. Most common pain will be due to plantarfascia inflammation. I don't know if by left side you mean in the arch or outside of the arch. If the pain is due to a sprain ie stepping off a curb, you may have pain in the cuboid bone which may be subluxed or out of position. The pain may require manipulation to reduce the position of the cubiod bone back and supportive inserts to prevent relapse.
See a doctor. There are many causes of foot pain, but without more history, it is difficult to even suggest what could be causing your pain. If it has been present for more than a few days, or if you had an injury, i would definitely suggest seeing a physician. If you didn't have an injury, and the pain has been present for less than 48 hours, you could wait a day or two to see if it will go away.

Related Questions

Left foot pain at the bottom of my foot in the arch?

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Several things. Depending on where exactly your pain is and when you have pain, there may be tendon involvement or just plantar fasciitis. You need to see a podiatrist to evaluate you. Read more...
Many possibilities. Heel pain is most often caused by plantar fasciitis, a condition that is sometimes also called heel spur syndrome when a spur is present. Heel pain may also be due to other causes, such as infection, tendonitis, arthritis, stress fracture, nerve irritation, retained foreign body, bone tumor, or a cyst. Have it evaluated by a professional and get the appropriate treatment. Read more...

My foot pain in only the left foot. It feels like burning and needles. From my foot all the way up to my knee?

Neuropathic pain . This is likely from an irritated nerve. Often their is an anatomic point where the nerve is being compressed. You will need a good neurologic exam and possibly an EMG / Nerve Conduction study. . Read more...
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What could be causing my foot pain and swelling on the top of my left foot? It hursts all day with no relief, and I did not enjure the foot.

Stress fracture. There are lots of reasons for insidious foot pain (pain for no apparent reason). Most common is a stress fracture. Most people do not remember any injury. Other reasons can be tendinitis, gout, neuritis or an infection. I would rest, ice and see my favorite podiatrist for an x-ray. Read more...
There are different. Reasons. One would be a stress fracture. A stress fracture does not have to occur secondary to a traumatic event. Simple walking can cause one to occur. This would cause both swelling and pain. I would follow up with a podiatrist or orthopod so that you can have x-rays and they can find a definitive diagnosis for you. Read more...
Nerve compression. There are nerves on the top of the foot that can become compressed due to swelling. I would see a podiatrist for exam and treatment. Read more...
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I have had left foot pain that has progressed over the past 3 weeks. When I look at my foot now there is a lump on it below the toes. It lies below but in between my big toe and second toe. It's tender and discolored a bit. It's about mid foot. Any idea w

Bruise. May have possible stress fracture. My advice would be to seek medical attention ASAP. Read more...
Mass or Mess. I'm afraid that this is one of those conditions that has to be physically examined to be able to make a call. It certainly sounds like soft tissue but actually feeling it is essential. One needs to distinguish as to it being an actual mass of the effects of bruising. You will have to consult with a specialist for the most reasonable solution. Read more...
Foot pain. with a lump should be examined by a doctor. Read more...