A report by housing charity Shelter and ComRes showed 37 per cent of people in the capital have experienced long-term stress, anxiety and depression as a result of housing issues over their lifetime.
Shelter said that if those figures were replicated across England, one million would have sought medical help because of mental health issues caused by poor housing, the threat of eviction, or rental troubles.
Shelter said research among Global Positioning System in England also found evidence of people visiting their doctor due to bad housing.
Global Positioning System say some of their patients diagnosed with anxiety and depression is directly due to housing problems.
Global Positioning System feel they need more help in supporting patients experiencing these problems.
Showing how linked housing and mental health are, nationally the research shows that a vast majority (69 per cent) of people who have experienced housing problems in the last five years such as poor conditions, struggling to pay the rent or being threatened with eviction, have reported a negative impact on their mental health.
"From families worrying about falling behind on the rent to people struggling with the misery of raising children in a tiny, mouldy flat - people can feel completely overwhelmed".
The charity is urging anyone overwhelmed by housing problems to get advice from Shelter, after one in 17 (6%) people in the region said they had visited their GP due to housing problems.