Why is my 4-year-old unable to walk with leg pain?

Hello,

Welcome to icliniq.com.

Thank you for reaching out.

I completely understand how worried you are. Seeing your 4-year-old suddenly have leg pain and struggle to walk is extremely frightening for any parent. From what you have described, it is reassuring that the doctors are doing all the right and careful tests, and several serious conditions already seem less likely.

The slightly raised ESR (erythrocyte sedimentation rate) and CRP (C-reactive protein) suggest some inflammation, which is very common in children and often follows a viral infection. The fact that her white blood cell count is normal is very reassuring and makes serious infection or cancer very unlikely.

The ultrasound showing no fluid in the hips is an important and comforting finding. This essentially rules out septic arthritis and makes a severe hip infection much less likely, which is a big relief.

In children her age, one of the most common causes of this kind of presentation is transient synovitis (a temporary inflammation of the hip joint) or viral muscle inflammation. These conditions can cause leg pain, low-grade fever, and refusal to walk, may switch from one leg to the other, and usually improve over days to weeks with rest and pain control.

The MRI (magnetic resonance imaging) has been planned to be thorough and safe. Conditions like discitis or a spinal infection are uncommon, but doctors wisely want to rule them out early because they can cause pain and walking difficulty. MRI is the best test to check for these.

Guillain-Barré Syndrome (a rare neurological condition in which the body’s immune system mistakenly attacks the peripheral nerves) is being considered because it can affect walking, but it usually causes progressive weakness rather than pain, and reflexes are typically reduced. Since your daughter’s symptoms are more pain-related, this diagnosis is less likely, but it is reasonable for doctors to exclude it.

It is completely understandable that your online search has raised fears about malignancy (cancer), but childhood cancers usually present with persistent fever, weight loss, night pain, worsening symptoms, or abnormal blood counts. Your daughter’s normal WBC (white blood cells) and sudden onset do not fit that pattern and are very reassuring.

Overall, based on what you have shared, this most closely looks like a post-viral inflammatory condition (meaning inflammation after a recent viral infection), which is common, temporary, and treatable in young children. The MRI is being done as a precaution to safely rule out rare but serious causes.

You are doing everything right by getting her evaluated early. Most children with this kind of presentation recover fully. Once the MRI results are available, things should become much clearer.

Try to take things one step at a time, you are in good hands.

I hope this helps.

Please revert in case of further queries.

Thank you.

Hi,

Welcome back to icliniq.com.

I read your query and can understand your concern.

What the doctor explained to you is actually very appropriate and reassuring. Not starting antibiotics right away is a good medical decision in your daughter’s case.

Since she is stable, with normal blood pressure (how well the heart pumps blood) and heart rate (how fast the heart is beating), and she otherwise looks well, doctors prefer to first find the exact cause of her symptoms.

Starting antibiotics (medicines used to treat bacterial infections) too early can sometimes mask the real problem and make it harder to see changes on an MRI (magnetic resonance scan is a detailed scan that shows the spine, nerves, and soft tissues clearly).

The MRI will help doctors rule out:

1. Discitis, which is the infection or inflammation of the disc between the spine bones.

2. Spinal infection is an infection in the bones or tissues of the spine.

3. An abscess is a pocket of pus caused by infection.

4. Nerve involvement problems affecting the nerves that control movement.

If the MRI shows anything bacterial, antibiotics can be started immediately, and they usually work very well when given early and correctly.

The fact that your daughter is being closely monitored, with regular checks and careful step-by-step testing, shows that the medical team is being thorough and cautious, not ignoring anything serious.

Right now, the overall picture still fits best with a temporary inflammatory or post-viral condition (meaning inflammation after a recent viral infection), which is common in young children and usually gets better completely with time and simple treatment.

I know the waiting is extremely stressful as a parent, but medically, you are on the right path, and nothing you have described points toward an emergency or cancer. Once the MRI report is available, things should become much clearer very quickly.

I hope this helps.

Please revert in case of further queries.

Thank you.

Hello,

Welcome to icliniq.com.

I completely understand your worry. When a child has pain and fever, the mind naturally goes to the worst possibilities. Based on what you have shared so far, malignancy is very unlikely and does not fit her current pattern. A CRP of 66 shows inflammation (attachment hidden to protect the identity of the patient), but CRP is not specific for cancer.

In childhood cancers like neuroblastoma or leukemia, we usually see persistent symptoms, abnormal blood counts, weight loss, night sweats, bone pain that does not improve with medicines, and often a child who looks progressively unwell.

Your daughter’s normal ultrasound, normal WBC, and good response to Paracetamol and Naproxen go strongly against malignancy. Yes, local trauma or muscle strain is very possible here. Doing splits or gymnastics can cause muscle or soft-tissue injury, and in children, this can trigger a significant inflammatory response, including raised CRP and temporary fever.

Pain starting the day after such activity supports this explanation. The fact that pain and fever settle with anti-inflammatory medicines is also reassuring. Cancer-related pain and fever usually do not respond so well and keep worsening.

At this stage, the most likely causes are post-viral inflammation, muscle injury, or a transient inflammatory condition. The planned MRI (magnetic resonance imaging) is the right step and will give clear reassurance. Right now, nothing you have described points strongly toward malignancy.

Thank you.

Hello,

Welcome back to icliniq.com.

I know this rise in CRP is frightening to hear, but please try to stay calm. A CRP of 165 means strong inflammation, most commonly due to infection or acute inflammation, not cancer.

In children, CRP can rise very fast and high in conditions like bone infection (osteomyelitis), muscle infection (myositis), disc inflammation (discitis), deep soft-tissue infection, or post-viral inflammatory reactions.

These are exactly the conditions doctors are trying to rule out with the MRI. Very important reassurance: Malignancy rarely causes CRP to rise sharply over 24 to 48 hours like this.

Cancer markers usually rise slowly and are accompanied by abnormal blood counts, weight loss, night sweats, persistent worsening pain, and a child who looks increasingly unwell. Your child’s picture is acute and inflammatory, not malignant.

The fact that fever and pain improve with naproxen and paracetamol also strongly supports inflammation or infection. Cancer-related fever usually does not respond well to these medicines.

At this point, the MRI is essential and appropriate. If it shows infection or inflammation, treatment (often antibiotics or anti-inflammatory care) can be started quickly, and children usually recover very well.

Right now, this CRP rise is concerning for inflammation, but reassuring against cancer. You are doing everything right, and the team is following the correct pathway.

I hope this helps you.

Thank you.

Hello,

Welcome back to icliniq.com.

I understand your concern.

That blood test is being done to check her haemoglobin and blood cells, which is a very routine and important step. Haemoglobin tells us if a child has anemia (low blood level). Significant anemia can sometimes happen with infection or inflammation, and it also helps doctors assess how unwell the body is and whether extra support is needed.

The white blood cells help show whether this looks more like a bacterial infection, viral illness, or inflammation. The platelet count also often rises in inflammation and helps support the diagnosis. This test is not specifically for cancer.

It is mainly to guide diagnosis and treatment, especially when CRP is high. In most inflammatory or infectious conditions in children, this test is done automatically to help doctors decide the next steps.

I hope this helps you.

Thank you.

Hello,

Welcome back to icliniq.com.

I understand your concern.

I hear your fear, and it’s completely natural to think this way when more blood tests are being done. Let me reassure you clearly and honestly. Doctors are not re-testing her blood because they think this is cancer.

They are doing it because her CRP is high, and whenever inflammation is high, doctors must monitor trends in haemoglobin, white cells, and platelets. This helps them decide infection vs inflammation, and how urgent treatment needs to be.

In childhood cancers, blood tests usually show persistent abnormalities like falling haemoglobin, very abnormal white cells, low platelets, or blasts on smear.

A normal or near-normal WBC with an acute rise in CRP fits infection or inflammatory conditions, not malignancy. Also very important: cancer does not cause CRP to double rapidly within a short time while the child still responds to pain medicines and has periods of comfort.

What your daughter has looks acute, inflammatory, and dynamic, which is why an MRI is planned. So please remember: These tests are being done to rule things out and guide treatment, not because doctors believe she has cancer.

Right now, the overall picture still strongly favors infection or inflammation, not malignancy. You are doing the right thing by asking, and the team is doing the right thing by being thorough.

I hope this help you.

Thank you.

Hello,

Welcome back to icliniq.com.

I understand your concern.

First, regarding why antibiotics were not started earlier, doctors often wait until imaging studies, such as magnetic resonance imaging (MRI) or ultrasound, and repeat blood tests are completed, unless the child appears toxic or clinically unstable.

Starting antibiotics too early can sometimes mask the true source of infection and make diagnosis more difficult. Now that serious surgical causes have been excluded and osteomyelitis (infection of the bone) is still a possibility, starting antibiotics at this stage is exactly the right decision.

Regarding leukemia, I want to be very clear and honest. Based on everything you have shared, leukemia is extremely unlikely. Your daughter has normal imaging results, including magnetic resonance imaging of the hips, knees, and femur.

Her walking is improving, even if only mildly. Her pain and fever respond to medications. Overall, this looks like an acute inflammatory condition rather than a bone marrow failure picture. This pattern does not fit leukemia.

Now, about the lactate dehydrogenase (LDH) test. This test is being done mainly to reassure everyone and to definitively close the concern about cancer, not because the doctors strongly suspect it.

Many medical teams order this test once so that parents do not continue to worry. A normal lactate dehydrogenase level, along with normal blood counts, usually brings the cancer discussion to an end.

Based on all the details provided, the most likely possibilities at this stage include early or deep osteomyelitis, which can have a normal magnetic resonance imaging scan in the early phase; a post-infectious inflammatory condition; reactive synovitis or myositis following a viral illness or minor trauma; or an inflammatory rheumatologic condition, which explains the involvement of a rheumatology specialist.

The treatment plan your medical team is following is standard and appropriate. It includes starting antibiotics, repeating blood test trends, checking urine to rule out a urinary tract infection, excluding rare causes, and reassessing the child’s response clinically.

The most reassuring sign you mentioned is that her walking is improving, even slightly. Cancer does not typically behave this way. Inflammation and infection do. I understand that your thoughts keep returning to leukemia.

That is a natural fear for a parent, but it is not supported by the medical findings. From a physician’s and neurologist’s perspective, nothing you have described strongly suggests cancer.

You are doing everything right, and the medical team is managing this correctly. At this point, the overall direction is toward recovery, not malignancy.

I hope this helps you.

Thank you.

Hi,

Welcome back to icliniq.com.

I’m really glad I could help ease your mind, and it means a lot to hear that it’s made this wait a little easier for you. At this point, waiting and watching how she responds to antibiotics is exactly the right thing.

In inflammatory or bone-related infections in children, we often see: Fever settling over a few days Pain gradually reducing Walking improving step by step, not all at once Small daily improvements matter more than perfection right now.

Please remember this: You acted early, you trusted your instincts, and you advocated for your child. That already puts her in the best possible position for a full recovery. If at any point you feel anxious again or notice something you don’t understand, don’t hesitate to ask.

For now, take a breath, rest when you can, and let the treatment do its work. I’m wishing your daughter a smooth and speedy recovery.

I hope this helps you.

Thankyou.

Hello,

Welcome back to icliniq.com.

I understand your concern.

This update is very reassuring. ESR (erythrocyte sedimentation rate) 31mm/hr is only mildly raised, and her white blood count is normal. Her gradual improvement in walking is the most important sign. Transient synovitis can cause fever and raised markers, and improves with anti-inflammatory medicines. At this stage, everything points toward a benign inflammatory condition, not cancer.

I hope this clears your doubts.

Thank you.

Hi,

Welcome back to icliniq.com.

You are welcome.