Many female patients suffer from a condition called metatarsalgia which is a pressure neuroma typically of the third and fourth metatarsal nerves. Friction on these nerves wears away the outer sheath exposing the nerve which then becomes extremely painful on walking.
You may read this article to know the ways to relieve foot pain. Again this is normally a footwear related condition and the only way to relieve the pain is to use flatter shoes with additional cushioning insoles or to opt for a surgical procedure to cut the nerve.
Weight is a significant factor because if someone is obese they are putting much more pressure on their joints and feet and therefore it is even more important to find correct fitting footwear, not least to support the arches but also to accommodate any swelling throughout the day.
Many overweight people suffer from plantar fascia rightists and heel pain which takes many months to heal. The only way to relieve this kind of pain without resulting in steroid injections is to wear gel heel cups or orthotic arch supports.
The development of diabetes from obesity can also cause major foot care issues if patients go on to develop ulcers that require specialist attention.
You can have foot pain from developing calluses and thickened layers of skin that contain corns and this can lead to ulcerations and infections, typically around the toes and forefoot. They form from friction and pressure due to poorly fitting footwear which may also form painful blisters.
The calluses and corns need to be treated and removed by a chiropodist/podiatrist who will then provide specialist padding and advice to prevent re-occurrence.