Tight Hamstrings and Flat Feet: The Hidden Connection

Updated October 2026 to include what I learned during a later course of physiotherapy.

I used to think my sore knees and stiff thighs were simply random aches from standing too long or feeling tired. After an MRI showed meniscus degeneration and I was referred for physiotherapy, I began to realise that the tightness behind my legs might be part of a wider movement problem.

My first physiotherapist connected my tight and weak hamstrings with the way I stood and moved with flat feet. Then, during a separate course of physiotherapy in 2026, Mona raised a similar possibility after working with me for a couple of sessions.

Neither experience means that flat feet caused every problem in my knees, back or legs. However, they helped me understand that the feet do not work in isolation—and neither do the hamstrings.

What Are the Hamstrings?

The hamstrings are a group of muscles running along the back of each thigh. They help bend the knee, extend the hip and control the leg during movements such as walking, climbing stairs and rising from a chair.

When these muscles feel tight, straightening the knee or bending forward may become uncomfortable. However, that sensation does not always mean the muscle is physically shortened. Weakness, prolonged sitting, activity levels, back or nerve problems, and the way someone moves can all influence how the back of the leg feels.

What My First Physiotherapist Found

My first physiotherapy experience followed the MRI that revealed meniscus degeneration. During the sessions, the therapist used infrared heat and TENS—the electrode pads that deliver gentle electrical pulses.

These treatments felt soothing and helped my knees feel looser temporarily, although I cannot say exactly how much each treatment contributed.

One day, the physiotherapist asked me to sit on a chair and extend my leg. I could not straighten it comfortably in the way he expected. He explained that my hamstrings appeared to be both tight and weak.

He also believed that my flat feet and the way I walked may have contributed to a chain of changes farther up my legs. That was the first time I began thinking beyond my knees and considering how my feet, legs and hips might influence one another.

 

How Might Flat Feet and Tight Hamstrings Be Connected?

Flat feet describe feet with low arches or arches that flatten when standing. Some people with flat feet also have greater inward movement of the feet while walking, commonly described as excessive pronation.

Movement at the feet can influence movement at the ankles, knees and hips. However, this does not mean that every person with flat feet has the same posture or movement pattern.

Research has found an association between pronated foot posture and hamstring tightness, but an association cannot tell us which came first or prove that one caused the other. The study involved young adults, so its findings should not be applied to everyone without caution.

A more realistic way to understand it is that the body works as a connected system. Foot posture may be one influence, alongside:

• Leg and hip strength

• Joint flexibility

• Balance and movement control

• Previous injuries

• Knee or back conditions

• Daily activity and prolonged sitting or standing

• Individual anatomy

For some people, the feet may be an important part of the picture. For others, tight hamstrings may have little or nothing to do with their arches.

You can read more about how the feet may influence stability in Feet and Balance: Understanding the Connection.

A 2026 Update: What Mona Told Me

During a later 20-session physiotherapy programme in 2026, I was treated first for my lower back and sciatica and then for my knees.

After working with me for a couple of sessions, Mona explained that my lifelong flat feet could have been one of the starting points in a wider chain of compensation. I understood this to mean that my body may have adapted over time to the way my feet supported me—not that my flat feet were responsible for every condition I had developed.

The tightness in my hamstrings became obvious during the early sessions. A basic stretch was extremely uncomfortable at first, but it gradually became easier.

The programme also revealed other things: weakness in my hips, legs and quadriceps, difficulty balancing on one foot, and movements I had unknowingly been compensating for. My back condition and sciatica added another layer, because discomfort coming from the back or nerves can sometimes be felt along the back of the leg.

This later experience gave me a more complete understanding than I had when I first published this article in 2025. My flat feet may have contributed to the chain Mona observed, but they were only one part of it.

I share more about the early hamstring work in My Physiotherapy Journey Part 2: Rebuilding My Back, One Session at a Time and the later strengthening and balance work in Part 3: Ten Sessions Focused on My Knees.

Can Hamstrings Be Tight and Weak at the Same Time?

Yes, a muscle can feel tight while also lacking strength or endurance. However, tightness alone does not prove that a muscle is weak.

In my case, my physiotherapists assessed my movement and believed that both tightness and weakness were present. This mattered because stretching alone was not the entire answer. My later programme also included controlled exercises for my hips, thighs, knees, back and core.

That experience taught me not to focus on one muscle—or one body part—without considering what is happening around it.

What Helped Me

 

Gentle Hamstring Stretching

Stretching became easier when I stopped treating it as something I had to force. During physiotherapy, the aim was controlled progress rather than reaching as far as possible.

Two gentler options include:

• Seated hamstring stretch: Sit with one leg extended and the other foot comfortably supported. Keep your back comfortable and lean forward slightly from the hips until you feel a gentle stretch.

• Supported lying stretch: Lie on your back and use a towel or strap around one foot to raise the leg gradually while keeping the movement comfortable.

A stretch should not cause sharp pain, numbness, tingling or pain travelling down the leg. Those symptoms may need assessment, particularly if you have a history of back problems or sciatica.

Some people use a standing forward fold to stretch the backs of the legs. Keeping the knees slightly bent may make it gentler, but it will not suit everyone—especially people whose backs or nerve symptoms are aggravated by bending forward.

 

Strengthening More Than the Hamstrings

My physiotherapy programme did not concentrate on hamstrings alone. It included exercises for my quadriceps, hips, glutes, back and core, as well as balance work.

That broader approach made sense for me because the weakness was not limited to one muscle group. It also helped me become more aware of how I controlled my knees and distributed my weight.

The correct exercises will differ from one person to another. A physiotherapist can assess whether the main issue is flexibility, strength, joint movement, nerve sensitivity or a combination of factors.

Supportive, Comfortable Footwear

Comfortable footwear or suitable insoles may help reduce foot discomfort and provide a steadier base. However, shoes cannot release tight hamstrings or permanently correct posture throughout the body.

I now see footwear as one part of managing my symptoms—not a complete solution.

My post Flat Feet and Foot Pain: Causes, Symptoms, and Relief explores supportive footwear and other comfort options in more detail.

Movement and Posture Habits

Small habits have also helped me:

• Changing position instead of standing completely still
• Avoiding locking my knees while standing
• Taking movement breaks after sitting for long periods
• Building activity gradually
• Paying attention to movements that trigger discomfort
• Keeping up with strengthening as well as stretching

One doctor also advised me to manage my weight. Body weight can affect the load placed on the feet and knees, but I do not see it as the sole explanation for pain. Strength, movement, existing conditions and daily habits matter too.

When to Seek Professional Advice

Consider speaking with a doctor, physiotherapist or podiatrist if:

• The tightness or pain persists or becomes worse
• You cannot straighten your knee normally
• Pain travels from your back or buttock down the leg
• You experience numbness, tingling or noticeable weakness
• Your knee swells, locks or repeatedly gives way
• Pain started after an injury
• The problem limits walking, sleeping or ordinary activities

Persistent discomfort behind the thigh is not always simply a tight hamstring. A professional assessment can help identify whether the symptoms involve the muscles, joints, back, nerves or another cause.

What I Understand Now

When I first wrote this article in 2025, I saw a fairly simple chain: flat feet, tight hamstrings, poor posture and knee strain.

After another course of physiotherapy in 2026, I understand that the relationship is more complicated. Mona believed my lifelong flat feet could have helped trigger a chain of compensation, and that explanation made sense in the context of what she observed while working with me.

But my flat feet were not the whole story. My hamstring tightness, muscle weakness, balance difficulties, knee degeneration, back problem and daily movement habits all had to be considered together.

The biggest lesson for me was not that one body part caused everything. It was that lasting improvement required me to look at the whole pattern—and to work on it patiently rather than forcing my body through pain.

Have you noticed tightness behind your legs as well as problems with your feet, knees or back? Share your experience in the comments. Our situations may not be identical, but recognising a pattern can be a useful first step toward asking the right questions.

 

Sources and Further Reading

 

• NHS: Flat feet⁠ — guidance on flat feet, symptoms, supportive options and when professional assessment may be helpful.
• Gulrandhe and colleagues: Correlation Between Foot Posture and Hamstring Muscle Tightness⁠ — a 2023 cross-sectional study that found an association between foot pronation and hamstring tightness in young adults; it does not establish cause and effect.

This article is based on my personal experience and research and is intended for informational purposes only. It is not a substitute for individual medical advice, diagnosis or treatment.