Conditions that cause severe foot pain include achilles tendinitis, bone spurs, bursitis and metatarsalgia, explains Mayo Clinic. Forms of arthritis that result in severe foot pain are osteoarthritis, rheumatoid arthritis and septic arthritis.
Achilles tendinitis is the overutilization of the tissue that connects calf muscles at the back of the lower leg to the heel bone, notes Mayo Clinic. While most cases can be treated at home with simple interventions, more severe cases need surgical repair from tendon tears. Achilles tendinitis most frequently occurs in runners who abruptly increase the intensity of runs and middle-aged people who only occasionally play sports.
Bone spurs form along the edges of bones and are often the result of osteoarthritis, according to Mayo Clinic. Bursitis inflicts pain by inflaming the tiny, fluid-filled sacs that pad the tendons, muscles and bones near joints. It typically appears near joints that have consistent repetitive motion. Metatarsalgia causes the ball of the foot to become swollen and painful. Poorly fitting shoes, jumping and running can lead to metatarsalgia.
Osteoarthritis is the most common type of arthritis and impacts millions of people throughout the world, states Mayo Clinic. It is the outcome of protective cartilage on the ends of bones wearing down with age. Exercising and maintaining a healthy weight can help, although no cure exists.