(Adds detail, comments)
* Index falls to lowest since Nov 2011
* Prolonged political crisis hits consumption
* Confidence down a 10th straight month
* Economy has not bottomed yet - professor
BANGKOK, Feb 6 (Reuters) - Thailand's consumer confidence dropped for a 10th straight month in January, a survey showed on Thursday, as the prolonged political crisis is making Thais reluctant to spend, adding to the country's economic problems.
The consumer confidence index calculated by the University of the Thai Chamber of Commerce (UTCC) slid to 71.5 in January, the lowest level since November 2011, from 73.4 in December.
"People are very concerned about their future," UTCC economics professor Thanavath Phonvichai told a news conference. "The economy has not reached its bottom yet."
A UTCC statement said consumers' consumption "is likely to fall further at least until late in the second quarter because the economy is slowing and there is no sign of recovery yet... confidence should pick up once the political situation eases but it's not clear when that will happen."
For weeks, anti-government protests trying to oust caretaker Prime Minister Yingluck Shinawatra have been blocking some roads in Bangkok and forcing ministries to shut their doors.
Thailand held a general election on Sunday but protests disrupted voting in one-fifth of constituencies, and it may be a long time before a new government can be formed.
The consumer confidence index has steadily declined since April, initially because of slowing economic growth and in recent months due to political turmoil.
(Reporting by Boontiwa Wichakul and Orathai Sriring; Editing by Richard Borsuk)