Symptoms & Progression: How FSHD Affects Your Body

FSHD follows a pattern that is often predictable but uniquely individual. While the name itself highlights the primary areas affected—the face, shoulders, and upper arms—the condition can involve other muscle groups as it progresses. Understanding these patterns and the “invisible” symptoms that often accompany them can help you better manage your daily life. For more on how to manage these symptoms, read Building Your Care Strategy.

The Hallmark: Asymmetric Weakness

One of the most defining features of FSHD is asymmetry ^[1][2]. This means that weakness often affects one side of the body more than the other ^[2]. You might find that you can lift your left arm easily while your right arm feels heavy, or that your smile curves more on one side than the other. This asymmetry is a key “hallmark” that doctors use to distinguish FSHD from other types of muscular dystrophy ^[3].

The Pattern of Progression

FSHD typically follows a descending pattern, meaning it moves from the upper body downward ^[1].

1. Face (Facio): Early signs often include difficulty whistling, drinking through a straw, or closing your eyes completely while sleeping ^[4].
2. Shoulders (Scapulo): Weakness in the muscles that stabilize the shoulder blades (scapula) can cause them to “wing” or stick out. This makes it hard to lift your arms above your head ^[1].
3. Upper Arms (Humeral): The biceps and triceps weaken, making lifting objects difficult ^[5]. Interestingly, the forearms are usually spared, meaning grip strength often remains strong even when the upper arm is weak ^[6].
4. Trunk and Lower Body: As the condition moves down, it can affect the abdominal muscles (causing the belly to protrude) and the lower legs. This often leads to foot drop, where the toes catch while walking ^[1].
   • Fall Risk: Because of foot drop and lower limb weakness, individuals with FSHD have a significantly higher risk of tripping and falling. An Ankle-Foot Orthosis (AFO) brace can provide critical stability ^[1].

While the disease is progressive, it moves slowly for most people. Roughly 20% of patients will eventually require a wheelchair for mobility ^[1][7].

Early-Onset vs. Classic Presentation

The speed and scope of symptoms often depend on when the disease first appears.

• Classic FSHD (Adult-Onset): Usually begins in the teens or 20s. Progression is typically slow, and symptoms are mostly limited to the muscles ^[8].
• Early-Onset FSHD: Defined by facial weakness before age 5 or shoulder weakness before age 10 ^[4]. This form tends to progress more rapidly, with about 57% of patients requiring wheelchair assistance in some cohorts ^[9]. It may also include systemic features (affects other organs), such as:
  • Hearing Loss: Often high-frequency hearing loss that may require monitoring ^[10].
  • Retinal Disease: Abnormalities in the blood vessels of the eye (Coats’ disease) which, if left untreated, can affect vision ^[10][11].

Underappreciated Symptoms

Beyond the visible muscle weakness, FSHD often brings “invisible” challenges that significantly impact quality of life:

• Pain and Fatigue: These are among the most common symptoms. Roughly 71% of patients experience chronic pain ^[12], and profound fatigue is frequently reported ^[13].
• Speech and Swallowing: Though usually mild, 35% of patients report difficulty with clear speech (dysarthria), and 25% to 40% report difficulty swallowing (dysphagia) ^[14][12]. These issues are often linked to weakness in the cheeks and facial muscles ^[14].

Managing Activities of Daily Living

As the disease progresses, simple tasks can become frustrating. If you lose the ability to lift your arms, an Occupational Therapist (OT) can provide specialized tools and strategies to help with Activities of Daily Living (ADLs)—such as using long-handled sponges for washing hair, dressing aids, or grabbing tools to reach high shelves. You do not have to just “live with” the frustration of daily tasks becoming harder.