Man on bench with cane
Multi generational family on walk
Older couple gardening

Welcome to Vortex Physical Therapy & Balance


Vortex Physical Therapy & Balance provides physical therapy for vestibular and neurological disorders, as well as balance issues.

Our clinic was founded in 2011 by Diron Cassidy, PT, MPT as the first physical therapy office in the Bay Area dedicated to the rehabilitation of vestibular disorders and balance problems. Our vestibular physical therapists work one-on-one with clients to reduce dizziness and improve their balance. Using the latest techniques and evidence-based practices, along with state-of-the-art equipment, we can help you recover and return to the activities of daily life.

We specialize in treating the following conditions:

  • Acoustic neuroma / vestibular schwanomma
  • Benign paroxysmal positional vertigo (BPPV)
  • Cervicogenic dizziness
  • Disequilibrium and gait abnormalities
  • Labyrinthitis / vestibular neuritis
  • Mal de Debarquement
  • Meniere’s disease
  • Parkinson’s disease
  • Persistent Postural-Perceptual Dizziness (3PD)
  • Peripheral neuropathy
  • Post-concussion syndrome
  • Stroke-related balance issues
  • Vestibular hypofunction (bilateral / unilateral)
  • Vestibular migraine

Do You Need a Doctor's Referral?

California offers Direct Access to physical therapy for 12 visits or 45 days. Most people do not need a doctor’s referral to start treatment. For a complete overview of this law, please click the link. Read more >>


Our office follows County Health Department guidelines regarding the use of face masks in healthcare offices. Currently, face masks are not required (as of March 31, 2024).

We still encourage the use of face masks for your own health. You are asked to wear a face mask if you have any symptoms, especially a cough or have been exposed to someone with Covid in last 10 days.