Trap muscle injections - what side effects can happen?

Injections in the trapezius is generally well-tolerated, but like any medical procedure it can have side effects. These are usually mild and temporary, but it’s important to know the possibilities.

Common, mild side effects

  • Soreness or bruising at injection sites

  • Tightness or heaviness in the shoulders for a few days when the medication kicks in

  • Temporary weakness when shrugging or lifting objects overhead

  • Neck stiffness as the area adjusts

Less common side effects

  • Shoulder fatigue during activities that rely on upper-trap strength

  • Feeling of reduced support around the neck/shoulder area

Rare but possible side effects

  • Neck instability if too much muscle is relaxed

  • Altered posture (usually temporary while other muscles adapt)

  • Difficulty holding heavy bags or weights

  • Spread of toxin causing unintended muscle weakness (very rare)

When to be cautious

Botox should be administered by an experienced practitioner who understands shoulder biomechanics and dosing, especially because the trapezius plays a role in scapular stability and posture.

The best practitioners for treating the trapezius with Botox are those who understand both cosmetic goals and shoulder/neck anatomy. You want someone who can balance aesthetics with safe muscle function.

Disclaimer

This blog is intended for educational purposes only and does not constitute medical advice. Any cosmetic procedure should be discussed thoroughly with a qualified healthcare provider to determine what is appropriate for your individual circumstances. Outcomes and experiences may vary.

To learn more or to book a consultation with a qualified expert, book TT Aesthetics.

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