Final answer:
Exposure to ionizing radiation, weakened immune system, and exposure to toxic substances are factors that can increase a person's risk for lymphoma.
Step-by-step explanation:
Factors that could increase a person's risk for lymphoma include:
- Exposure to ionizing radiation, such as radon gas.
- Having a weakened immune system.
- Being exposed to other forms of radiation or certain toxic substances.
Examples of toxic substances that increase the risk of lymphoma include arsenic.