You can fail a physical exam for a wide range of reasons depending on the type of physical, but the most common triggers are uncontrolled blood pressure, poor vision or hearing, a positive drug screen, or a medical condition that makes the job or activity unsafe. “Failing” a physical usually means you don’t meet a specific threshold set by a regulator or employer, not that something is catastrophically wrong with your health. Here’s what actually gets flagged across the most common types of physicals.
Blood Pressure: The Most Common Surprise Failure
High blood pressure is probably the single most frequent reason people walk in feeling fine and walk out without clearance. Many people don’t know their blood pressure is elevated until it’s measured during the exam. For commercial truck and bus drivers taking a DOT physical, the cutoffs are strict and specific. A reading at or below 140/90 gets you a full two-year certification. Stage 1 hypertension (140-159 systolic or 90-99 diastolic) limits you to a one-year certification. Stage 2 (160-179 systolic or 100-109 diastolic) gets you only a three-month temporary certification to bring it under control.
A reading above 180/110 is an automatic disqualification. You can’t drive commercially until your blood pressure drops below 140/90, and even then you’ll only receive six-month certifications. For non-DOT employment physicals and sports physicals, elevated blood pressure can also delay clearance, though the exact thresholds vary by employer or athletic organization.
Vision and Hearing Standards
Vision requirements are straightforward but unforgiving. DOT physicals require at least 20/40 vision in each eye, with or without corrective lenses, plus a field of vision of at least 70 degrees horizontally in each eye. You also need to distinguish between red, green, and amber, the standard traffic signal colors. If you can’t hit 20/40 even with glasses or contacts, you fail.
Military entrance physicals at MEPS are similar but add extra layers. Your corrected vision must reach at least 20/40 in each eye, and your uncorrected refractive error can’t exceed plus or minus 8.00 diopters. If your vision can only be adequately corrected with contact lenses rather than glasses (due to corneal scarring or irregular astigmatism, for example), that’s a disqualifier. Laser eye surgery like LASIK isn’t automatically disqualifying, but you must be at least 180 days past the procedure and your original prescription must have been within those same limits.
For DOT and military physicals, hearing loss beyond a set threshold is a regulatory disqualifier. Drivers who can’t meet the hearing standard can apply for a federal exemption, though the process takes time.
Drug Screening Failures
Most employment physicals include a urine drug test, and a positive result for substances like marijuana, cocaine, amphetamines, opioids, or PCP will cause a failure regardless of your overall health. This catches people off guard in states where marijuana is legal recreationally, because federal workplace standards and DOT regulations still treat it as a disqualifying substance. The FAA is explicit on this point: medical marijuana, even if legally prescribed under state law, is grounds for denial of a pilot medical certificate.
Some prescription medications can also trigger a positive screen. If you have a valid prescription, you’ll typically need to provide documentation, though certain medications are inherently disqualifying for specific roles. For pilots, the FAA maintains a lengthy “Do Not Issue” list that includes controlled substances of any schedule, most psychiatric medications (antipsychotics, ADHD drugs, mood stabilizers, most antidepressants), seizure medications even when prescribed for migraines, and weight loss drugs like phentermine.
Heart and Cardiovascular Red Flags
For sports physicals, especially at the youth and college level, the cardiovascular screening is the most consequential part of the exam. The examiner listens for heart murmurs graded above II/VI, irregular heart rhythms, and delayed pulses. These findings don’t necessarily mean you have a dangerous heart condition, but they can halt clearance until further testing rules out problems like hypertrophic cardiomyopathy, the most commonly reported cause of sudden cardiac death in young athletes.
If the examiner hears something concerning, you’ll likely be sent for an echocardiogram, an ultrasound of the heart that can detect structural abnormalities like abnormal coronary artery origins or valve problems that a stethoscope alone would miss. Clearance is delayed until those results come back clean.
Failing a Military Entrance Physical
The military entrance physical at MEPS is one of the most thorough screenings most young people will ever experience, and the disqualification list is extensive. Beyond vision, the orthopedic review is a common stumbling block. Any history of back problems in the past 24 months that limited your physical activity, required a brace or support, or needed medication for more than six weeks can disqualify you. Specific spinal fractures, including any cervical spine fracture or a lumbar fracture that compressed more than 25 percent of the vertebra’s height, are disqualifying.
Chronic joint pain in the shoulders, knees, ankles, or hips that prevents you from maintaining a physically active lifestyle is also disqualifying. The standard isn’t whether you can push through pain; it’s whether the condition would “reasonably be expected to prevent satisfactory performance of duty.” Conditions like spondylolisthesis (where a vertebra slips out of position) are automatic disqualifiers regardless of symptoms.
Body composition is another hurdle. If you exceed the height and weight limits, you’ll undergo a tape test that estimates body fat from circumference measurements. Soldiers who fail that can request a supplemental assessment using more precise technology like a DXA scan (which uses low-dose X-rays to separate bone, muscle, and fat) or a Bod Pod, which measures body volume using air displacement. If you fail all available assessments, you won’t be eligible for enlistment.
Job-Specific Physical Performance Tests
Some jobs, particularly in public safety, require a functional capacity evaluation where you physically demonstrate that you can do the work. These aren’t pass/fail based on a single number. Instead, an evaluator watches you perform tasks like lifting, carrying, and sustained physical activity, and stops the test if your technique breaks down or you show signs of distress.
A task gets aborted at the first sign of altered technique or reported discomfort. For example, if you can carry 40 pounds with proper form but start leaning to compensate at 50 pounds, your limit gets documented at 40. If you’re using momentum to hoist weight overhead rather than controlled strength, that’s flagged. During cardiovascular testing, you’ll typically need to sustain 20 minutes of activity while keeping your heart rate between 65 and 85 percent of your estimated maximum (calculated as 220 minus your age). Abnormally elevated pulse, signs of significant fatigue, or any symptoms suggesting heart or lung problems will end the test early.
Range of motion is also measured. If a joint doesn’t move through its full expected range, the evaluator either measures the deficit in degrees or notes whether the limitation prevents you from performing a required task. The specific benchmarks depend entirely on the job you’re being evaluated for.
Conditions That Are Automatic Disqualifiers
Certain medical conditions trigger an immediate failure for regulated physicals, with no room for interpretation. For DOT commercial driver physicals, the four regulatory disqualifiers are hearing loss beyond the standard, vision loss beyond 20/40, epilepsy, and insulin-dependent diabetes (though the diabetes and vision standards have recently been updated with new exemption pathways). Drivers who don’t currently meet these standards can apply for federal exemptions, but they can’t be certified until the exemption is granted.
For pilots, the disqualifying medication list alone is extensive: angina drugs, most centrally acting blood pressure medications, cancer treatments, Parkinson’s medications, the antimalarial drug mefloquine, and high-dose steroids (above 20 mg prednisone daily equivalent) all result in an automatic deferral. The exam won’t even be completed if you’re currently taking any of these.
What Happens After You Fail
Failing a physical rarely means you’re permanently locked out. For DOT drivers with high blood pressure, bringing it under control with medication or lifestyle changes and retesting is a clear path back. The FMCSA runs exemption programs for drivers who don’t meet the seizure or hearing standards, allowing them to apply for permission to operate in interstate commerce. Vision and diabetes exemptions have recently been rolled into updated standards rather than requiring a separate application.
For military applicants, some conditions qualify for a medical waiver depending on the branch and the specific issue. For employment physicals, you may be able to retest after addressing the problem, whether that’s lowering your blood pressure, losing weight, or completing physical therapy for a joint issue. The key is understanding exactly which standard you didn’t meet, because the fix is usually specific and achievable.