Any trip which involves a change of climate and diet can lead to difficulty in physical adjustment. One should take along some usual medicines, such as those for colds, diarrhea and constipation, though they are available at drugstore. Those who take special medicine on a regular basis should be sure to carry an adequate supply with them. It is advisable to avoid unboiled water and raw or under-cooked meat. Medical treatment in China is usually very inexpensive.