11 Surprising Symptoms Associated With Noonan Syndrome

9. Hearing and Speech Delays

Many individuals with Noonan syndrome experience hearing difficulties, including mild to moderate hearing loss. This can result from recurrent ear infections, structural ear abnormalities, or nerve-related (sensorineural) hearing loss. Speech delays are also very common, often due to low muscle tone (hypotonia) affecting the mouth and tongue, as well as hearing challenges. Children may have difficulty forming words, delayed speech milestones, or a distinct nasal or breathy voice quality. Early intervention with speech therapy, hearing aids, or medical treatment for ear infections can significantly improve communication skills and confidence.

10. Joint Hypermobility and Muscular Weakness

Many individuals with Noonan syndrome have loose, hypermobile joints, which can lead to poor coordination, joint pain, and increased risk of sprains and dislocations. This occurs due to abnormal connective tissue function, similar to what’s seen in conditions like Ehlers-Danlos syndrome. Children may exhibit low muscle tone (hypotonia), leading to delays in crawling, walking, or fine motor skills like writing and buttoning clothes. Adults may experience chronic joint pain, stiffness, or fatigue, making physical activities more difficult. Physical therapy, targeted exercises, and supportive braces can help improve strength and prevent long-term complications.