1. Growing pains are most common The most common cause of pain in the lower limbs is growing pains. At night, when sleeping, children often call for leg pain or joint pain in the lower limbs, and when they rub them, the pain is relieved. The next morning after waking up, the pain disappears and everything moves freely. This kind of joint pain is a common phenomenon when children are growing, and we call it growing pains. In particular, children between the ages of 3 and 8 years old can grow 7 to 8 centimeters taller each year, and because the bones grow rapidly while the nerves, tendons, and muscles around them grow relatively slowly, they can produce pulling pain. This pain may be related to excessive growth, overexertion, weather changes or micronutrient deficiencies. Characteristics of the pain: The pain is mostly found above and below the knee joint, sore or tingling, mostly in the evening or before bedtime, and lasts for a few minutes, rarely more than an hour. The pain has no obvious fixed site and is not accompanied by redness, swelling or heat. If hot compresses or light massage are applied, the pain will disappear soon. Calcium supplements alone cannot relieve growing pains. Children who develop growing pains usually like to run and jump, but have a poor diet or are picky eaters such as rarely eating vegetables. It is undeniable that some children will be deficient in calcium during this time, but calcium supplementation will not help much in relieving the growing pains. This is because the cause of growing pains is not in the bones, but in soft tissue fatigue. Excessive amounts of calcium preparations are not well absorbed by children. The most important treatment for growing pains in children is timely rest. Every night before going to bed, soak the child’s feet and calves in hot water. However, when the child is not fatigued, more activity should be encouraged to build muscle strength. When the pain is heavy, local massage and painkillers can be taken, and vitamin C can also be taken in moderation. after proper rest, exercise, massage and symptomatic treatment with drugs, pediatric growing pains will be cured soon. 2, there are many causes of joint pain Not all joint pain is growing pain, Cheng Fuli reminded parents, when children have joint pain, parents can first ask their children, which joint pain? Has he or she been traumatized? First rule out trauma-induced pain, and then make a judgment based on physical signs. In addition, parents can also look at the painful joints to see if the skin is red, warm, or swollen, and to see if the joints can move and if the pain worsens after activity. In addition to this, parents should also take the child’s temperature, as most acute arthritis is associated with a fever. Here are some other conditions that commonly cause joint pain Transient hip synovitis: the cause is unknown and may have a history of minor injuries, upper respiratory tract infections, etc. Mostly seen in 3-10 years old, common around 5 years old, mostly unilateral, acute hip pain or radiation to the inner thigh and knee, more males than females. The child refuses to walk down or walks with a limp in the affected limb. There is no joint swelling, but there is limited pressure pain and a small amount of joint effusion on MRI. The pain may disappear in a few hours or days. Synovial impaction: Mostly caused by mild trauma, etc., with walking limp, pain in the affected limb, and significant restriction of joint movement. Aseptic necrosis of the femoral head: unexplained claudication, difficulty in squatting; pain in the medial knee without local pressure; pressure pain in the center of the affected hip, internal or external rotation of the hip may induce pain, or partially restricted activity; late pain relief or no symptoms, muscle atrophy of the affected limb or shortening of the lower limb, mildly restricted or normal hip joint activity. Osteochondritis of the tibial tuberosity: common between the ages of 8-15, more males than females, mostly unilateral. The tibial tuberosity is painful and locally swollen after exercise, and there may be pressure pain or percussion pain. The pain can be induced when squatting or going up or down stairs. The pain is relieved or disappears after a few days of rest. Rheumatic fever: It is easy to cause pain in large joints such as ankle, knee, hip, wrist, elbow and shoulder, i.e. rheumatic arthritis, which may be accompanied by different degrees of joint swelling and pressure pain. The pain is short-lived, and some of them are only 1-2 days to subside. If uncontrolled, it can cause rheumatic heart disease. Allergic purpura arthritis: one or more joints are swollen and painful, along with skin purpura, a few do not appear purpura, if left untreated, it can lead to kidney damage. Rheumatoid arthritis: common in 4-10 years old, patients with fever and arthralgia. Acute hematogenous osteomyelitis: persistent local pain, refusal to touch and feel. Acute septic arthritis: common in children 1-3 years old, with rapid onset, significant pain in the joint area, refusal to touch or press, and severe pain when the joint is slightly moved. Traumatic fractures and dislocations: severe pain that increases with touch or percussion of the distal end.