Bangkok has declared a 60-day state of emergency following the continued political unrest from anti-government protesters.
The FCO has issued a statement saying that all travellers should take extra care and avoid all protests, political gatherings, demonstrations and marches.
This follows the news that a number of major events have been cancelled in Thailand this month, as a result of the protests.
The government has urged travellers to stay clear from several of the key protest sites including Sala Daeng, Asoke, Pathumwan, Ratchaprasong, Victory Monument, Lat Phrao and the government complex at Chaeng Watthana.
Hannah Fletcher, events and marketing manager at Chambers Travel, said: "Bangkok has dropped off the radar as a C&I destination.
"Bangkok doesn't have the high end appeal, or exclusivity required for incentive groups, especially when you compare it to Singapore or Vietnam, which have much more to offer."
Reports say that attacks involving weapons and explosives have taken place at protest sites.