Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein. Lyme disease is a bacterial infection spread by ticks. You can get Lyme disease if you're bitten by an infected tick. But most people who've had a tick bite don't get Lyme disease. It's important to treat Lyme disease to prevent problems with your skin, joints, heart, and nervous system. Lyme disease is caused by bacteria. Infected ticks spread the bacteria by biting people or animals. Two types of ticks carry the Lyme disease bacteria in the United States. They are: Dogs, cats, and horses can become infected with Lyme disease bacteria, but they can't pass the infection to humans. But infected ticks may move from animals to humans and then bite and infect humans. To help prevent Lyme disease, cover your skin when you will be in wooded or grassy areas. Wear a hat, a long-sleeved shirt, and long pants with the legs tucked into your socks. Use a bug repellent with DEET. Check clothing, pets, and outdoor gear before going inside. Remove any ticks. Lyme disease often causes a round, red rash at the site of the tick bite. This rash spreads and can get very large. Flu-like symptoms are also common. If Lyme disease is not treated, you can develop swelling and pain in your joints and long-term problems with your heart and nervous system. Your doctor will do a physical exam and ask questions about your symptoms. Your doctor will also ask if you've been around infected ticks. A round, red rash is often a sign of Lyme disease. You may have a blood test to see if you have certain antibodies in your blood. Lyme disease is treated with antibiotics. It's important to get treatment for Lyme disease as soon as you can, to prevent problems with your skin, joints, nervous system, and heart. The problems often get better with antibiotics. But in rare cases, they can last the rest of your life. The symptoms of Lyme disease depend on the stage of the disease. Symptoms usually start within the first month after the tick bite. If the disease isn't treated, it may progress from mild symptoms to serious, long-term problems. If you don't have symptoms during stage 1, your first symptoms may be those found in stage 2 or 3. Contact your doctor if: To diagnose early Lyme disease, your doctor will do a physical exam. You will be asked about your symptoms and if you've been around infected ticks. A common sign of the infection is an expanding round, red rash (erythema migrans). Your doctor may do blood tests to confirm that you have Lyme disease. In some cases, your doctor may treat you for Lyme disease without doing any tests, if your symptoms are clearly related to Lyme disease. Lyme disease is often hard to diagnose. Early on, blood tests may not show Lyme disease even though you are infected. At later stages, blood tests may not be able to tell if you have an active infection or a past infection that you recovered from. The symptoms of chronic Lyme disease can be very similar to other illnesses. People may test positive even though something other than Lyme disease is causing their symptoms. Lyme disease is treated with antibiotics. Most often the antibiotics are taken by mouth. But sometimes antibiotics need to be given through a vein (intravenous, or I.V.). It's important to get treatment for Lyme disease as soon as you can, to prevent problems with your skin, joints, nervous system, and heart. These can occur weeks, months, or even years after your tick bite. The problems often get better with antibiotics. But in rare cases, they can last the rest of your life. Even after successful treatment for Lyme disease, you can get it again. So it's important to keep protecting yourself from tick bites. To prevent Lyme disease in the future Current as of: September 30, 2025 Author: Ignite Healthwise, LLC Staff Current as of: September 30, 2025 Author: Ignite Healthwise, LLC Staff Clinical Review Board This information does not replace the advice of a doctor. Ignite Healthwise, LLC disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use and Privacy Policy. Learn how we develop our content. To learn more about Ignite Healthwise, LLC, visit webmdignite.com. © 2024-2025 Ignite Healthwise, LLC.Lyme Disease
What is Lyme disease?
What causes it?
Can you prevent it?
What are the symptoms?
How is it diagnosed?
How is Lyme disease treated?
Prevention
Symptoms
When to Call a Doctor
Exams and Tests
Treatment Overview
Self-Care
Related Information
Credits
Clinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein. Current as of: September 30, 2025 Author: Ignite Healthwise, LLC Staff Clinical Review BoardLyme Disease
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

