Sudden pain in the hamstrings is common for the following reasons: First, consider acute plantar fascia injury, such as after strenuous sports, or after a large number of long-term sports activities, there may be sudden plantar fascia pain, usually plantar fascia strain or strain, the main pain manifested as severe pain and tear-like pain in the heart of the foot. Second, consider acute lumbar disc herniation, such as when bending over to carry heavy objects, or when intra-abdominal pressure increases during activities such as stooling and coughing, suddenly causing lumbar disc herniation, which will compress the nerve roots and cause acute lower limb radiated pain, which can radiate to the feet. Third, consider calcium deficiency, when calcium deficiency is very easy to cause cramps in the hands and feet, which can manifest as spasmodic pain in the feet.