Nail infection stopped them from wearing open-toed shoes and going swimming and being active. GP & foot expert Dr. Gill Jenkins explained, “Fungal nail infections are notoriously hard to get rid of without treatment and they can cause pain, swelling and itchiness.For many sufferers, these painful symptoms have a serious impact on their lives, making it harder to be active on a daily basis.Not only does a painful foot stop you from exercising, but it often makes it hard to fall asleep too. Fast treatment is key because fungal nail infections are contagious between feet, hands and between people.