Nepal is one of the safest places in the world. Violent crimes are very rare, and the only real concern to a traveler is petty theft. However, if you take basic common sense precaution, there is nothing to fear. Don't bring valuable things with you unless necessary for your trip. Keep your money and other valuables in a money belt or pouch strapped around your waist. Lock your bags and luggage. Moreover if you join the trekking company to organize your trekking trip you don't have to be worried for all above. They will take care concerning all about your safety and security.

Report it immediately to the police. They are normally comfort and helpful. If you need a police report for insurance purposes, you have to go to the Interpol Section of Nepal Police located at Naxal. Moreover your trip operator company, like ABC Adventures (P) Ltd will do a lot regarding your help.

Yes, you shouldn't have to go for trekking in the controlled trekking areas without having trekking permit or mountaineering permit and National park entrance permit for every where as well.

As said, prevention is better than cure; it's highly recommended that you bring medicines for common illness like nausea, vomiting, cold and flu when you come to Nepal. Though there are many pharmacy shops in Kathmandu and Pokhara, it's worth carrying some basic medicinal stuffs like insect repellent, sunscreen, lip balm, eye drops, bandages and so on. You can find effective medicines against amoeba diarrhea in any drug store in Kathmandu and Pokhara Carry some with you when you are going to be away on trekking trails. A dehydrations package called "Jeevan Jal" is found everywhere in Nepal; it is quite effective.

As in any poor country with enough "rich" foreigners, Nepal has its share of street beggars and middlemen touts trying to sell you everything from information to drugs. There is no need to be intimidated by them. If you are not interested, mind your own business or tell them to leave you alone.