Filipinos travelling to Thailand were told not to display red or yellow items to avoid being caught up in the political unrest there, the Philippine embassy in Bangkok said.
"Participating and/or showing support in any form to any of the parties is strongly discouraged," the mission said in a travel advisory on its website.
"For [your] information, the red and yellow colours are closely identified with some of the parties involved," it said in the note to Filipino travellers.
The protests are aimed at overthrowing the popularly elected Prime Minister Yingluck Shinawatra, sister of ousted former leader Thaksin Shinawatra, and her government.
Thaksin's overthrow in 2006 by generals loyal to the king ushered in years of political turmoil and rival street protests by the royalist "yellow shirts" and Thaksin's supporters, known as the "red shirts".