Now if the hip flexors are not working correctly (whether they are 'weak' or 'inhibited') then the SCM will have to work extra hard. And a SCM that is working more than it needs to be can impact the brachial plexus (a network of nerves that pass through the arm). This in turn can cause a whole host of other problems such as carpal tunnel, thoracic outlet syndrome and tingling extremities amongst other problems.
A SCM that is working extra hard to do the job for the hip flexors will also become 'stronger' which may result in the muscles at the back of the neck becoming 'weaker' or inhibited.
Regular readers of my blog will not be surprised to hear that, when a client comes to me suffering with migraines, then I will not simply focus on the site of pain. For, as you have seen in the explanation above, if the issue is that the SCM is working more because the hip flexors are not doing their job then that is where we will be focusing our attention, the hip flexors.
So you see, if you have problems that are not being resolved, please start thinking outside the box. Maybe those headaches are a result of your hip flexors needing a bit more work.
Start with lying hip flexor activation work (see video). Keep them light so as not to bring the SCM into play. Do enough reps to feel like you are working (NOT to fatigue). This may be 10 reps, it may be 20. For some of you that have not had their hip flexors working it may just be 3-5 reps. Attempt to do these maybe 4-6 times a day if possible. Build up the reps and sets over time.
Now that being said, although the hip flexors may appear 'weaker', there are times when they are actually being inhibited by their opposing muscles, the hip extensors. But that's for another post!