India's safety picture is mixed and varies enormously by region and traveler type. Most tourist circuits are well-traveled and safe. Solo female travelers should exercise extra caution, particularly in parts of northern India: avoid walking alone at night, use app-based taxis, and research specific city safety before arrival.
Health is the most consistent concern: drink only bottled or purified water, avoid uncooked vegetables from street stalls, and take malaria prophylaxis for rural areas. Delhi Belly (traveler's diarrhea) affects many visitors. Check UK/US government advisories for Jammu & Kashmir and the northeastern states before visiting.