Neurofibromatosis Type 1 (NF1) is often diagnosed at birth or early childhood. The first signs may be light brown spots on the skin (called café au lait spots) or freckles in the armpit, or bone deformities. Later issues may include bumps on the iris (the color part of the eye) or under the skin (called neurofibromas), short stature, and tumors on the optic nerve. Children with NF1 may also experience migraines, learning disabilities, attention problems, and seizures.
Neurofibromatosis Type 2 (NF2) is less common and more likely to be diagnosed in early adulthood. Tumors almost always form along the nerves near the brain that are responsible for hearing and balance. These are called acoustic neuromas or vestibular schwannomas, types of skull base tumors that can cause hearing loss, balance problems, and facial weakness or paralysis. Other tumors can form in the brain and along the spine, causing headaches, sensory problems, and muscle weakness.
Schwannomatosis is rare and is usually diagnosed in young adults. Tumors can form along nerves near the brain, spine, and peripheral nerves and can cause debilitating pain. People with this type of neurofibromatosis require ongoing monitoring and treatments from multiple specialists.