Rent arrears are becoming the fastest-growing debt problem in the UK, according to the Money Advice Trust charity.
In the first nine months of this year, its telephone helpline received nearly 20,000 calls from people behind with their rent.
That represents a 37% increase compared with the 2011 figure, the charity said.
More than half the calls to the National Debtline are now from people renting their home.
A recent survey by LSL property services suggested that rents across the country have risen to an all-time high.
"Rent arrears are now the fastest growing debt problem we help people with at National Debtline," said Joanna Elson, the chief executive of the Money Advice Trust.
"We are in danger of falling into a rent debt crisis," she said.
Figures from the Office for National Statistics this week show that the proportion of people renting their homes has increased.
In 2012, more than a third of households were renting.
National Debtline suggested five priorities for people struggling with their rent.
- Don't bury your head in the sand
- Work out a personal budget
- Rent is a priority debt
- Make sure you receive any housing benefit you are entitled to
- Speak to your landlord