For widespread back and neck pain, over-the-counter options can provide effective relief. You may try acetaminophen to help reduce pain, or a nonsteroidal anti-inflammatory drug (NSAID) such as ibuprofen or naproxen to target both pain and inflammation, provided you have no underlying stomach or kidney issues. Applying a warm compress to relax the muscles or an ice pack to reduce inflammation can also help. Please follow the package instructions carefully. If your pain is severe, persists for more than a few days, or is accompanied by numbness, tingling, or weakness in your arms or legs, please consult a doctor for a personalized evaluation.

Your symptoms of leg pain and numbness following a lower back injury suggest nerve compression, such as sciatica or a herniated disc. For temporary pain and inflammation relief, over-the-counter NSAIDs like ibuprofen can help. However, because you are experiencing numbness, which is a neurological symptom, you should not self-medicate. It is crucial to see a doctor for a proper physical evaluation and potentially an MRI. They can prescribe targeted nerve pain medications (like gabapentin) or physical therapy. Seek immediate emergency care if you develop progressive leg weakness or loss of bowel/bladder control.

For immediate relief from tooth pain, you can take paracetamol or paracetamol with an anti-inflammatory. Rinse your mouth with warm salt water and avoid very hot, cold, or sweet foods. This will give temporary relief only. A cavity needs dental treatment (filling or root canal). Hence, please see a dentist as soon as possible to fix the cause of the pain.

For temporary relief from severe tooth pain due to a cavity, you can take an over-the-counter pain reliever like Ibuprofen (400 mg) every 4 to 6 hours, as it helps reduce inflammation. Alternatively, Acetaminophen (500 mg) can be used. Always take these with food to avoid stomach upset. Do not place any pain relief tablets directly against your gums, as this can cause chemical burns. Please remember that medication only masks the pain temporarily; it does not cure the cavity. You must consult a dentist as soon as possible to treat the decay and prevent a deeper, more painful infection.

For menstrual cramps, over-the-counter NSAIDs (Non-Steroidal Anti-inflammatory Drugs) like Ibuprofen (200-400 mg) or Naproxen are highly effective because they target the prostaglandins that cause uterine contractions. Always take these with food to protect your stomach. Alternatively, Acetaminophen (Paracetamol) can help but may be less effective for cramps. Applying a heating pad to your lower abdomen and staying hydrated can also provide quick relief. If your pain is severe, worsening, or not relieved by these medications, please consult a doctor for a personalised evaluation.

For occasional severe headaches, over-the-counter pain relievers like ibuprofen, acetaminophen, or a combination formula containing caffeine can help. However, because severe headaches can be migraines or sign of an underlying issue, I highly recommend consulting a doctor for a proper diagnosis. They can prescribe targeted treatments like triptans if necessary. Please seek emergency medical care immediately if your headache is sudden and explosively severe (a 'thunderclap' headache), or if it is accompanied by fever, a stiff neck, confusion, numbness, difficulty speaking, or vision changes.