Sciatic pain from the waist down the right leg is usually due to nerve compression like Sciatica (a condition in which irritation, inflammation, or compression affects the sciatic nerve). Take rest, avoid bending or heavy lifting, use warm compresses, and do gentle stretching exercises. For relief, you can take Paracetamol or, if suitable, an anti-inflammatory, and apply a topical gel. If pain is severe, persistent, or associated with numbness, weakness, or difficulty walking, consult a doctor for proper evaluation and treatment.