Physical therapy is worth starting as soon as a problem begins limiting how you move, work, or go about your day. For acute injuries like sprains or strains, the ideal window is within the first 7 days. But injuries aren’t the only reason to go. Persistent pain, post-surgical recovery, balance problems, pelvic floor issues, and childhood developmental delays all have their own timelines and triggers.
After an Acute Injury
The sooner you start, the better. Clinical guidelines recommend an initial physical therapy consultation within the first 7 days of a musculoskeletal injury. For common problems like sprains, strains, and tendon issues, the typical time away from normal activity is 8 to 14 days, and early PT helps keep that window short.
Waiting too long creates a compounding problem. If you’ve been limited in your movement or off work for 6 to 8 weeks without improvement, the recovery process becomes more complex and often requires input from multiple providers, not just a physical therapist. Pain that lingers, stiffness that isn’t resolving, or a joint that still feels unstable weeks after an injury are all clear signals you’ve waited long enough.
You don’t need to see a doctor first in most cases. All 50 U.S. states allow some form of direct access to physical therapy, meaning you can schedule an evaluation without a physician’s referral. The specific rules vary by state (some limit the number of visits or require a referral after a set period), so check your state’s provisions if you’re unsure. But in general, a physical therapist can be your first point of contact for up to 8 weeks after an injury.
Before and After Surgery
If you have a scheduled surgery on a joint, your surgeon will almost certainly prescribe physical therapy afterward. But understanding the timeline helps you plan. After a hip replacement, for example, rehabilitation unfolds in three phases. The first six weeks focus on protecting the new joint and letting tissue heal. Weeks 6 through 12 shift to restoring range of motion and rebuilding strength. A final phase, lasting from about 12 to 24 weeks post-surgery, targets return to higher-level activities like running or sports.
For knee surgeries like ACL reconstruction, the arc is similar: early protected movement, then progressive strengthening, then functional training. The key point is that PT typically starts within days of surgery, not weeks. If your surgeon hasn’t discussed a rehabilitation plan before the procedure, ask about it. Starting rehab on schedule is one of the strongest predictors of a good outcome.
Prehabilitation, or PT before surgery, is also increasingly common. Strengthening the muscles around a joint before it’s operated on can shorten recovery time and improve your results afterward.
Chronic or Recurring Pain
You don’t need a specific injury to benefit from physical therapy. Chronic back pain, neck stiffness, recurring headaches tied to muscle tension, and repetitive strain from work or exercise are all reasons people seek PT, and all respond well to it. The general rule: if pain has persisted for more than a few weeks and isn’t improving on its own, it’s time.
Low back pain is the most common reason adults see a physical therapist. If yours has lasted more than four to six weeks despite rest and over-the-counter pain relief, a PT evaluation can identify whether the problem is muscular, joint-related, or something that needs further medical workup.
Red Flags That Need Medical Attention First
Most musculoskeletal pain is safe to treat with physical therapy right away, but certain symptoms suggest something more serious is going on. These warrant a visit to your doctor or an emergency room before starting PT:
- Unexplained weight loss: losing more than 10 pounds in three months without changing your diet or activity level
- Fever, chills, or night sweats alongside back or joint pain
- Pain that wakes you at night and isn’t related to how you’re positioned
- Numbness in the groin or inner thighs (sometimes called saddle anesthesia)
- Loss of bladder or bowel control, or sudden changes in urinary frequency
- Progressive weakness in one or both legs that’s getting worse, not better
These can indicate infections, tumors, fractures, or nerve compression that requires medical treatment before rehabilitation can safely begin. A physical therapist is trained to screen for these signs during an evaluation and will refer you to a physician if anything concerning comes up.
Dizziness and Balance Problems
Vestibular physical therapy is a specialized branch that treats dizziness, vertigo, and balance disorders. You should consider it if you experience frequent unsteadiness, difficulty walking in the dark, trouble reading because your visual field feels unstable, or vertigo triggered by head movements. Everyday tasks like showering with your eyes closed, bending down, or navigating crowded spaces can become difficult when the inner ear or balance system isn’t functioning well.
Not all dizziness is a vestibular issue. Lightheadedness from blood pressure changes or sudden drop attacks (where your legs give way without warning) typically need medical evaluation first. But for the spinning, tilting, or unsteady sensations that come with inner ear problems, vestibular PT is one of the most effective treatments available.
Fall Risk in Older Adults
For adults 65 and older, physical therapy is one of the primary interventions for reducing fall risk. The CDC’s screening protocol for community-dwelling older adults uses three simple tests: a timed walk-and-sit test, a 30-second chair stand, and a four-stage balance test. When any of these reveal poor gait, strength, or balance, the recommended next step is a physical therapy referral.
If you or a parent have had a fall in the past year, feel unsteady when walking, or avoid certain activities out of fear of falling, those are strong indicators. Falls are the leading cause of injury-related death in older adults, and targeted PT programs that work on strength, balance, and coordination can cut fall rates significantly.
Pelvic Floor Issues After Childbirth
Pelvic floor physical therapy addresses a range of postpartum symptoms that many people assume they just have to live with. These include urinary incontinence (leaking when you cough, sneeze, or exercise), a sensation of vaginal looseness or heaviness, pain during sex, pelvic or perineal pain, and difficulty fully emptying your bladder. Recurrent urinary tract infections can also be related to pelvic floor dysfunction.
Pelvic floor muscle training is the first-line treatment for stress urinary incontinence and vaginal laxity. For pain during sex, therapists often combine muscle training with gentle electrical stimulation to address muscle tightness and reduce discomfort. These aren’t problems limited to the postpartum period. Pelvic floor PT helps people of all ages and genders, but the postpartum window is when many of these issues first appear and when early intervention does the most good.
Developmental Delays in Children
Pediatric physical therapy focuses on gross motor skills: the big movements like rolling, sitting, crawling, standing, and walking. If your child isn’t meeting these milestones within the expected age ranges, a physical therapy evaluation can determine whether they need support.
Pediatricians typically screen for motor delays at well-child visits, but parents often notice first. If your baby isn’t rolling by 6 months, sitting independently by 9 months, or walking by 18 months, those are reasonable points to bring up concerns. Early intervention programs in most states provide evaluations at no cost for children under 3, and starting therapy early tends to produce better long-term outcomes than waiting to see if a child “catches up” on their own.