Men in the capital are half as likely as women, to contact a cancer support network, despite being more likely to face a diagnosis.
According to research from MacMillan, 2,300 men from London called the charity's helpline last year compared to 5,300 women.
The organisation has now launched a new drive to encourage men to seek help.
We've been to meet a novice Strong Man from Northolt, Craig Toley, who faced a cancer diagnosis in his 20s.
He says it was only when he spoke openly about his illness that he was able to fight it.
This month, Macmillan Cancer Support is launching their 'Just Say the Word' campaign with the construction, home improvement, electrical and technology sectors, to encourage men with cancer to seek help. The aims is to empower men from across the UK to take control of their health and seek the support they need.
Macmillan says that talking is an important part of coping with cancer. The charity has worked with men with cancer to create a campaign to raise awareness of cancer and inspire others to ask for help.