What Just Changed

The CDC issued a specific warning on April 23, 2026: weekly ER visit rates for tick bites are the highest they've been for this point in the year since 2017.

CDC epidemiologist and Lyme disease expert Alison Hinckley said: "Tick season is here and these tiny biters can make you seriously sick."

The Numbers Behind the Warning

The Johns Hopkins Bloomberg School of Public Health reported that May 2025 saw a 30% increase in ER visits for tick-borne illnesses compared to May 2024, according to WBAY.

State health departments reported more than 89,000 confirmed Lyme disease cases in 2023, the most recent year with complete data, according to reporting by Katie Couric Media. But the CDC's own treatment data tells a different story — roughly 476,000 people are treated for Lyme annually. That gap between confirmed cases and treated patients represents a massive diagnostic failure the system still hasn't fixed.

What Mainstream Coverage Is Leaving Out

Most mainstream outlets are treating this as a seasonal reminder. Wear bug spray. Check for ticks. Here's a graphic of a deer tick.

The 30% year-over-year ER surge from 2024 to 2025 — documented by Johns Hopkins — combined with the CDC's new 2026 alert suggests this isn't cyclical variation. The curve is moving upward and accelerating.

Nicole Baumgarth of Cornell University's Baker Institute for Animal Health said experts are "more worried this year" than last, according to WBAY. That's a scientist affiliated with one of the most credible institutions in American medicine confirming the situation is deteriorating.

The Lone Star tick's meat allergy syndrome continues to spread northward and is increasingly linked to serious allergic reactions. WBAY noted the connection directly. This is a second, distinct tick-borne threat that gets less coverage than Lyme despite affecting people's ability to eat red meat for the rest of their lives.

Why Ticks Are Getting Harder to Detect and Kill

Constantin Takacs, assistant professor of biology at Northeastern University and a researcher studying how Borrelia burgdorferi — the bacterium behind Lyme — proliferates in ticks, explained that deer ticks have evolved specialized proteins that suppress the host's immune response and nerve sensitivity at the bite site.

No pain. No swelling. No itch. The tick feeds for 24-plus hours and you may never know it's there.

Nymph ticks — the ones responsible for most Lyme disease cases when they emerge in May — are the size of a poppy seed, according to Takacs. You're not going to spot one unless you're doing a deliberate, thorough body check.

The Geography Problem

Lyme disease remains concentrated — roughly 90% of U.S. cases come from the Northeast, mid-Atlantic (Virginia to eastern Canada), and Upper Midwest states including Wisconsin, Michigan, and Minnesota, according to CDC 2023 data cited by Katie Couric Media.

But tick ranges are expanding. The Lone Star tick already documented its northward migration. Black-legged deer ticks are following warming temperatures into new territory.

This is becoming a national problem, not just a Northeast one.

What You Actually Do About It

Baumgarth of Cornell University's Baker Institute for Animal Health noted you don't need to run to the ER the second you find a tick — transmission of Lyme bacteria requires roughly 24-48 hours of attachment. Remove it, bag it, refrigerate it, and watch for symptoms over the following 3 to 30 days: fever, fatigue, headache, muscle aches, swollen lymph nodes, or the classic bull's-eye rash.

Hinckley of the CDC recommends EPA-registered insect repellent, permethrin-treated clothing, and immediate tick removal as your best practical defenses.

Permethrin is the real tool most people skip. It's a synthetic insecticide applied to gear and clothing that kills ticks on contact. It's not the same as DEET. It goes on your clothes, not your skin.

The Alert

The government confirmed what the data has been showing for weeks: 2026 tick season is already running hotter than any year since 2017, with the worst months still ahead. A 30% ER surge in 2025 set the baseline. Scientists say 2026 clears it.

Tick prevention is a preventable public health problem getting worse largely because people treat it as an afterthought. The bugs are faster, more widespread, and harder to detect than most people realize.

Check your body after you go outside. Every time.