This is the latest advice from the UK’s Foreign and Commonwealth Office on Thailand: there is a high threat from terrorism throughout Thailand, particularly in the far southern provinces of Pattani, Yala, Narathiwat and Songkhla. We recommend against all but essential travel to these four provinces where, since January 2004, there have been regular attacks including bombings and shootings. On 3 April, three bombs exploded in Songkhla Province, one at Hat Yai International Airport, one at a hotel and one in a shopping centre. Further attacks against places frequented by foreigners, including tourist resorts, could occur at any time.
Watch out for crimes of opportunity. Theft of passports and credit cards is a problem. Passport fraud is high and penalties are severe.
Penalties for possession, distribution or manufacture of drugs are severe and can include the death penalty.
There has been an increase since January 2005 in the number of reported cases of Dengue Fever, in particular in Southern Thailand and the area near the border with Malaysia. In a very small number of cases, Dengue Fever can be fatal if left untreated. If you suffer from a fever whilst (or shortly after) visiting Thailand, you should consult a doctor.