| Risk Factors
Lyme disease is a bacterial infection. The infection is spread from the bite of an infected deer tick.
Lyme disease is caused by bacteria found in some deer ticks. An infected tick passes Lyme disease to humans through its bite.
If untreated, the bacteria can pass into the blood. The blood will carry it through the body. The bacteria may then settle in various body tissues.
Factors that increase your chance of Lyme disease include:
Living in the northeastern, northwestern, mid-Atlantic, or upper north-central regions of the United States and northwestern California
- Outdoor activities, such as hiking, camping, and gardening in areas/seasons with deer ticks
- Living near or going to wooded, grassy areas
- Working outdoors such as surveying, landscaping, forestry, gardening, and utility company service work
The symptoms of Lyme disease will be different in each person. They can also range from mild to severe.
The first sign may be a red rash. The rash starts as a small red spot at the site of the tick bite. It will then spread over the next few days or weeks to form a circular or oval-shaped rash. Sometimes, the rash resembles a bull's eye with a red ring around a clear area with a red center. The rash may cover a small dime-sized area or a wide area of the body.
Lyme Disease Rash
This is an example of a Lyme disease rash shaped like a bull's eye. It may not always be this shape, nor will a rash always appear.
Copyright © Nucleus Medical Media, Inc.
In the first 3-30 days after the bite, if the infection has not spread you may notice:
- Muscle and joint aches
- Swollen glands
These symptoms do not necessarily mean you have Lyme disease, even if you have spent time outdoors. See your doctor right away if you have these symptoms and think you have been exposed to a tick.
An infection that has begun to spread may cause the following symptoms in days to weeks after the bite:
- Multiple lesions
- Persistent headache, stiff neck
- Diffuse numbness, tingling, burning
- Intermittent joint pain and swelling
- Impaired motor coordination
- Irregular heart rhythm
- Muscle pain and swelling
Facial paralysis—Bell's palsy
Symptoms can develop months or years after the tick bite in untreated infections. These symptoms may occur regularly or intermittently and include:
Painful inflammation of the joints—arthritis
- Trouble with concentration or memory
- Shooting pains, numbness, and tingling
Less common symptoms of late Lyme disease include:
- Heart abnormalities
Eye problems, such as
- Chronic skin disorders
- Limb weakness
- Persistent motor coordination problems
Lyme disease may be diagnosed based on your symptoms and the history of a tick bite.
After 4 weeks of Lyme disease, your body may create antibodies against
the infection. A blood test may help look for these antibodies. The blood test cannot confirm or rule out Lyme disease. Instead, the results of the blood test will be used in combination with your symptoms and personal history to make a diagnosis.
Lyme disease responds well to antibiotics. These medications can kill bacteria.
The length of your antibiotic treatment will depend on your condition. You may need to take them for 10 days to 3 weeks or more. You may be given the antibiotics by mouth or by IV.
To relieve pain from chronic arthritis you doctor may recommend:
Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen and naproxen
- Corticosteroid injection directly into the joint
To help reduce the chance of Lyme disease:
If you live or are visiting northeastern, northwestern, mid-Atlantic, or upper north-central regions of the United States and northwestern California:
- Avoid areas that are likely to be infested with deer ticks, such as moist, shaded, wooded, or grassy areas
When going to wooded, grassy areas, especially in spring and summer:
- Wear light-colored clothing with a tight weave to spot ticks easily.
- Wear enclosed shoes.
- Wear a long sleeve shirt. Tuck it into your pants.
- Tuck pants into socks or boot tops.
- Wear a hat.
- Stay on cleared, well-traveled paths and walk in the center of trails to avoid overgrown grass and brush. Avoid sitting on the ground or stone walls.
- Remove leaf litter, brush, and woodpiles from around the home and the edges of the yard.
Insect repellent can help prevent tick bites. Repellents containing DEET can be applied to clothes and exposed skin.
that have permethrin can be applied to pants, socks, and shoes, but not to skin. Repellents can cause eye irritation and skin reactions. Be sure to read the label for instructions on application, including:
- Do not apply near eyes, nose, or mouth.
- Do not apply to children's hands.
- Wash your skin when you return indoors.
Deer ticks are unlikely to pass the infection unless they are in contact with the skin for at least 24 hours. After spending time outdoors in a high risk area:
- Do a full-body check for ticks at the end of a day spent outdoors. Consider bathing or showering within 2 hours of coming indoors.
- Check your child for ticks. Make sure to check for hidden areas like the hair, around the ears, or behind the knees.
- Check pets and gear for ticks.
- Put clothes worn outdoors in the dryer for 20 minutes. This will kill any unseen ticks.
If you do find a tick,
by doing the following:
- Use a pair of tweezers to grasp the tick by the head, as close to the skin as possible.
- Pull directly outward. Use gentle but firm force. Do not twist the tick out. Try not to crush the tick's body or handle it with bare fingers. This can spread the infection.
- Wipe the site with an antiseptic to prevent infection.
There are some steps that do not help. They may cause more problems.
- Do not put a hot match to the tick.
- Do not cover the tick with petroleum jelly, nail polish, or any other substances.
If you have been bitten by a deer tick, especially if you live in an area where Lyme disease is common, you should watch for a rash to appear. A rash can occur in about 70-80% of infected persons and generally begins at the tick bite site. The rash may appear within 3-30 days, usually before the onset of fever. The rash is usually the first sign of infection, is usually circular, and is called erythema migrans (EM). Some may develop additional EM lesions on other parts of the body.
If you have a tick bite and live in a high-risk area, your doctor may recommend a dose of antibiotic. This may reduce the risk of contracting Lyme disease if taken within 72 hours after a tick bite. However, this antibiotic can have serious side effects in children younger than 8 years old. This prevention step is only used in people older than 8 years of age.
The risk of getting Lyme disease after a single tick bite is low. Many experts do not recommend preventive antibiotic treatment.
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Last reviewed February 2016 by David L Horn, MD
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