The Committee of Royal Physicians said the monarch "experienced intermittent twitching of his right hand and his heartbeat was slightly increased" and sustained "minute subdural bleeding in the left frontal area," the Bangkok Post reported.
Medication alleviated the symptoms and the king's right hand, heartbeat and pressure returned to normal, doctors said.
The 66-year-old Bhumibol, Thailand's longest reigning monarch, had planned a visit to the Khao Cha-ngum Land Development Project in in Ratchaburi province Sunday.
Notable deaths of 2014 [PHOTOS]
Pakistan PM urges eradication of polio