He has difficulty moving around and needs someone to take care of him.
Tips
usage
不便 is polite and formal. It often means 'it's not appropriate' rather than just 'inconvenient.' 不便透露 = 'not convenient to disclose' (polite refusal). 给您带来不便 is the standard apology phrase in service contexts.
usage
方便 (fāngbiàn) = convenient (the positive form). 不方便 is more casual/spoken; 不便 is more formal/written.