At 8 months pregnant, back and rib pain are very common as your body adapts to your growing baby. The safest medication for temporary pain relief is paracetamol (acetaminophen). You should strictly avoid anti-inflammatory medicines like ibuprofen or aspirin during your third trimester, as they can cause complications for your baby. For non-medicinal relief, try warm compresses, supportive pregnancy pillows, and gentle stretching. While these aches are usually normal, please consult your obstetrician before taking any medication, or seek immediate medical attention if the pain is severe, sudden, or accompanied by a headache, vision changes, or swelling.