Public health, like medicine, focuses on three stages of prevention: primary, secondary, and tertiary. Primary prevention means preventing disease before it occurs by altering behaviors.

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There are four stages of syphilis: primary, secondary, latent, and tertiary. But symptoms don’t always occur in the same order, and they may overlap from stage to stage. You can also be ...

You can have either primary, secondary or tertiary adrenal insufficiency. Primary adrenal insufficiency is when your adrenal glands are damaged and can’t make the cortisol you need. They also ...

All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary industry. Industries in the primary and secondary sectors are the ...