Differential Diagnosis: Essential Questions for Plantar Heel Pain

Plantar fasciopathy is a common complaint seen by physios. Naturally, it’s often front of mind when a patient presents with heel pain, but we need to be careful not to jump to a diagnosis. Not every case of Plantar Heel Pain (PHP) is plantar fasciopathy, and subtle details in the subjective assessment should shift your clinical reasoning.

In her Practical, Dr Melinda Smith shows us exactly how she assesses patients presenting with PHP, highlighting how gathering the right information early can not only help you differentiate between causes of pain, but also set you up for optimal management of a condition which is known to be stubborn. This blog outlines key areas your subjective assessment should explore to help differentiate the source of pain, and contributing factors to its onset.

If you’d like to see exactly how expert physio Dr Melinda Smith assesses PHP, watch her full Practical here. With Practicals, you can be a fly on the wall and see exactly how top experts assess and treat specific conditions – so you can become a better clinician, faster. Learn more here.

Start with load

Changes in load remain a key driver of many PHP presentations, but they’re not always obvious.

Patients frequently report that nothing has changed, yet further discussion may reveal increased activity, different footwear, recent illness, or lifestyle shifts that have altered either:

a) how the foot is being loaded and/or:
b) the capacity of the tissues to withstand load

Load is not limited to sport. Occupational demands, prolonged standing and changes in body mass can all contribute to symptom onset. Exploring these factors helps you determine whether the presentation aligns with a mechanical overload pattern or whether you need to widen your differential diagnosis.

Location, location, location

Patients’ descriptions of where their pain sits can provide valuable clues. More medial pain that extends into the arch may align more closely with plantar fascia involvement, whereas central or lateral heel pain may point towards a plantar fat pad issue.

Diffuse or poorly localised symptoms should raise suspicion for calcaneal bone stress injury or inflammatory presentations. It is also worth exploring symptoms beyond the foot itself. Lumbar or sacroiliac discomfort, or conditions affecting adjacent joints, may influence neural structures and contribute to heel pain presentations.

When the mechanism doesn’t fit

An acute onset of heel pain should always prompt deeper questioning. A sudden mechanism may suggest plantar fascial rupture or a heel fat pad contusion rather than a gradual fasciopathy presentation.

If swelling and redness are present without a clear loading trigger, consider whether inflammatory arthropathies or other systemic contributors could be involved.

Imaging

Imaging often raises as many questions as answers. Plantar heel spurs are commonly seen on X-ray, particularly in older populations or those with higher body mass index, but their presence does not necessarily correlate with symptoms.

In some cases, they may increase the likelihood of lateral plantar nerve irritation, which reinforces the importance of clinical reasoning when interpreting results. Ultrasound imaging may show thickening of the plantar fascia, yet this finding should always be integrated with the subjective and clinical picture rather than used in isolation. Watch Melinda explain how imaging findings sit within the context of her assessment in this video from her Practical:

Listening to symptom behaviour

The classic pattern of pain with the first steps in the morning that warms up/eases with movement is often associated with plantar fasciopathy, so keep an eye out for these clues in the subjective.

Patients who strongly dislike weightbearing or prolonged standing at all times may instead be presenting with heel fat pad involvement or a calcaneal bone stress. Descriptions of burning or shooting pain can indicate neural sources, although clinicians should remember that the first branch of the lateral plantar nerve may not produce the pins and needles or numbness typically associated with neural symptoms.

Medical history

A thorough medical history can reshape your differential diagnosis. A known inflammatory arthropathy, skin rashes such as psoriasis, or other systemic symptoms may suggest a broader underlying process. Heel pain can be the first symptom for approximately 15% of people with spondyloarthropathy, so these questions matter. Diabetes is another factor to consider, as plantar pain appears to be more prevalent in this population.

Contributing factors

Contributing factors to plantar heel pain extend beyond local tissues. Previous injuries, including hip pain or issues on the contralateral side, may alter loading strategies and contribute to symptom development. Occupational demands and psychosocial factors can also influence how symptoms present and persist. Identifying these elements during the subjective assessment allows you to build a more complete picture of the patient’s experience. Watch Melinda explain key considerations in this clip from her Practical:

Wrapping up

A detailed subjective assessment can reveal far more than the presence of plantar fasciopathy alone.

By paying attention to load history, symptom behaviour, medical context and subtle clinical clues, physiotherapists can refine their differential diagnosis and guide more targeted management.

If you want to see exactly how an expert assesses PHP, watch Dr Melinda Smith’s full Practical HERE.