At Significantly Higher Risk 
• The incidence of lymphoma increases with age and is more common in men than in women. Most occur in 
  people who were previously healthy.
• Occupational exposure in the flour, forestry and agricultural industries has been reported to increase the risk 
  of developing certain types of intermediate- and high-grade lymphoma.
• People with congenital or acquired abnormalities of their immune systems or who take medicine to suppress 
  their immune systems have a higher incidence of lymphoma.
• There is an increased incidence of intermediate- and high-grade lymphomas in people infected with the HIV 
  virus for four or more years.
• Exposure to radiation or chemotherapy .