The pain on the bottom of the foot like a cramp may be caused by plantar fasciitis, or it may be caused by lumbar disc herniation. 1. Plantar fasciitis: the plantar fascia is a tendinous connective tissue of the sole of the foot, spanning between the medial tuberosity of the heel bone and the proximal phalanges of the toes, and it has a good cushioning effect on the sole of the foot. If the plantar fascia is irritated by long-term wear and tear or stretching, it will cause aseptic inflammation of the fascia, resulting in obstruction of local blood circulation and accumulation of metabolic products, which will stimulate the nerve root and cause pain symptoms. 2. Lumbar disc herniation: degenerative lesions of the lumbar spine can lead to the appearance of lumbar disc herniation, lumbar disc herniation will occur in the dehydration of the disc, resulting in the rupture of the annulus fibrosus, the nucleus pulposus protrudes to the posterior or lateral posterior, resulting in the nerves innervating the plantar region by the cardiac compression, the appearance of plantar region of the sensory and muscular abnormality, it may also be manifested in the plantar pulling like a pain in the foot symptoms. There may also be other causes of plantar cramp-like pain, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.