Millions of Americans will be shopping for health insurance in 2018. If you’re one of them, there are many factors to consider: Premiums, deductibles, services covered, and so forth.

Here are five of them:

1. Assess your specific needs.

The best health insurance plan for you depends on your health situation—from pre-existing conditions to medication and allergies.

But also consider your financial situation: Are you looking for a short- or long-term insurance option? If you’re self-employed, you should consider a major medical plan. But if you’re seeking a traditional job, you should try a more basic plan—in case your potential employer covers health insurance.