Some common remedies for muscle pain relief include:
Giving rest to the affected area
OTC pain relievers such as acetaminophen (Tylenol) or ibuprofen (Motrin IB, Advil)
Cold compress (ice packs or cold cloths) for the first 3 days of pain
Hot compress (hot cloths or heating pads) for any pain after the first 3 days
Gentle stretching, meditation, and yoga
Avoiding weight-lifting and other physical activity until the pain subsides

You may notice stiffness or weakness in the affected area. However, if symptoms like fever, difficulty breathing, a rash, a bite mark, dizziness, swelling or redness are observed, seek immediate medical attention.

If symptoms like fever, difficulty breathing, a rash, a bite mark, dizziness, swelling or redness are observed, seek immediate medical attention.

The most common causes of muscle pain are overuse of muscles, stress, or minor injuries. However, other underlying conditions which can cause muscle pain include chronic fatigue syndrome, fibromyalgia, myofascial pain syndrome, infection (flu, polio, etc), autoimmune disorders (dermatomyositis, lupus, etc), hypokalaemia, and thyroid issues.

With icing and cold compress, the pain should subside within the first 3 days. However, if the pain persists, hot compress is recommended. Any form of muscle pain that lingers for a month or longer will often be the result of other underlying causes.