Heel pain is most often the result of overuse. Rarely, it may be caused by an injury. Your heel may become tender or swollen from: Shoes with poor support or shock absorption.
https://medlineplus.gov/ency/article/003181.htm
If your pain is in your heel, you may have plantar fasciitis. That’s an irritation or inflammation of the band of tough tissue connecting the heel bone to the toes. Usually, it hurts the worst in the morning when you’re getting out of bed. You can feel it in your heel or in your arch.
http://www.webmd.com/pain-management/guide/foot-pain-causes-and-treatments
Heel pain usually affects the underside or back of your heel. Although heel pain is rarely a symptom of a serious condition, it can interfere with your normal activities, particularly exercise.
http://www.mayoclinic.org/symptoms/heel-pain/basics/definition/SYM-20050788
1 When the tendon that connects the back of your leg to your heel becomes swollen and painful near the bottom of the foot. 2  Swelling of the fluid-filled sac (bursa) at the back of the heel bone under the Achilles tendon (bursitis)  Bone spurs in the heel.
https://medlineplus.gov/ency/article/003181.htm
Finally, heel pain sometimes arises because the foot does not absorb shock as it should. Less frequently, the patient’s heel pain is a result of a nerve entrapment, tendon dysfunction, or other plantar structural changes of the foot. Other common causes for heel pain include: Achilles tendonitis.
http://www.footvitals.com/heel/pain.html
1 When the tendon that connects the back of your leg to your heel becomes swollen and painful near the bottom of the foot.  Swelling of the fluid-filled sac (bursa) at the back of the heel bone under the Achilles tendon (bursitis)
https://medlineplus.gov/ency/article/003181.htm
Conditions that may cause heel pain include: 1  When the tendon that connects the back of your leg to your heel becomes swollen and painful near the bottom of the foot.  Swelling of the fluid-filled sac (bursa) at the back of the heel bone under the Achilles tendon (bursitis)
https://medlineplus.gov/ency/article/003181.htm
Heel Pain — Symptoms, Causes, and Treatment Options. Dr. Dr. Heel pain is very common, especially among adults over the age of 40 and children between the ages of 8 and 13. It is usually the result of daily weight-bearing activities and exercise. The calcaneus, or heel bone, is the largest bone in the foot. It is also the first bone to make contact with the ground when walking or jogging, which makes the heel prone to stress and pain. In 30 percent of cases, heel pain affects both feet. The left heel is typically the first to be affected.
http://www.footvitals.com/heel/pain.html
Conditions that may cause heel pain include: 1  When the tendon that connects the back of your leg to your heel becomes swollen and painful near the bottom of the foot. 2  Swelling of the fluid-filled sac (bursa) at the back of the heel bone under the Achilles tendon (bursitis)  Bone spurs in the heel.
https://medlineplus.gov/ency/article/003181.htm
If you have pain, some causes include: Plantar fasciitis is the most common condition that causes heel pain. Plantar fasciitis is due to irritation and inflammation of the tight tissue that forms the arch of the foot. Common symptoms of plantar fasciitis include heel pain with prolonged walking and standing. A spur is commonly associated with plantar fasciitis.
https://www.verywell.com/heel-pain-information-and-causes-2549378
what causes pain in the heel of my foot
Plantar fasciitis caused pain in the heel of foot.