Could my muscle tiredness after workout be caused by an undiagnosed condition?

[MattyT123]

I'm 31 years old and have lost weight in the past 5 years, from 9.5 stone (133lbs) down to 8.5 stone.

I have been trying to gain weight again, I did a 15 minute workout, for hard gainers like myself with the help of a YouTube video. Mainly chest and arm area.

After stopping, my arms feel so tired, it feels heavy up to my shoulders washing my hands on the tap water.

Today, I only did 40 press ups, my arms feel a little shaky and weak.

This last for 2 days, gets a little better the next day after workout.

Could there be something I'm doing wrong or should do before and after?
I never had problems like this before.

It took me years and years to gain weight, gained weight last 2014-16 then last 2016, I had this pins and needles all over caused me to faint.

Been in and out of the gp since then with multiple different symptoms. From pressure in the head, ears and back, back numbness that cause me tension headaches,numbness in the lower and upper back that hurts a bit when pressed, acid reflux, lower left side pains. Had multiple blood tests, all normal.

I even mentioned it to my gp once, before Covid19 who was baffled and gave me another blood test.

I had physiotherapy last year and nothing much cured my back pain.

When doing workout, I never felt like this in the past, it would be tired, but not enough to make my arms tired getting things from the top cupboard or washing hands.

I'm unsure if there could be an underlying condition or back or neurological problems.

Or is this because I haven't been working out in a while?

I went cycling last weekend, was lightheaded after stopping, went so  anxious I thought I would faint, but didn't.

Before I could do 100 pushups, when I started to try and workout again, I could only do 20. Now 40.

[Staceymel7]

Sounds to me like it may be coming from your neck or potentially TOS. There’s definitely some nerve impingement due to the symptoms you’re describing. That also can cause muscle weakness. No blood test will able to detect that you need to see a neurologist or PT. The neck can be a challenging place for any doctor to diagnose. If you aren’t getting better with these avenues I would suggest an upright mri or DMX to determine what is going on in your cervical spine. As far your weight, that may be a separate issue or none at all.

[Paxiled]

I'm guessing you don't mean gain weight but gain muscle.  Won't necessarily make you weigh more, weight lifting is actually a good way to lose weight.  So you want to look muscular.  If you want to gain weight you need to eat more.  Just clarifying.  As to your symptoms, I'd get a really thorough check-up, that's a lot of symptoms.  Your GP may not be the best person for this, you might need referrals to specialists.  While an orthopedic surgeon might be able to diagnose something that is pinching a nerve, he won't be able to diagnose all the different things you're mentioning.  Blood tests can be useful but only if your doctor is ordering the right ones -- for example, one possibility is thyroid problems, and doctors pretty much never give the right test for that unless you specifically request it.  Same can go for blood sugar problems or problems with electrolyte levels or problems with your diet lacking the right foods to give you all the nutrients you need.  Good luck finding your answers.  Oh, meant to say, any time you do something new or something you haven't done for awhile expect soreness.  Expect to take some time to get back to where you were.  And if you're seriously trying to bodybuild to add bulk, Mom is right about that, it's intentionally done to make you stress.  If it doesn't stress, you probably won't add muscle.  Bodybuilders hurt all the time.  Weight lifting for maintaining fitness doesn't do that, as most who do that don't constantly increase the weight they're lifting, they're looking for the exercise more than the huge muscles.  

[specialmom]

I think muscle fatigue is one of the things that a program going to build bulk is going to shoot for.  I can feel very odd with a range of reactions in my body to a different or intense work out session.   You possibly have a pinched nerve?  You mention things like numbness and pain which can be associated with that.  I think if I had chronic pain, I'd keep working with the physical therapist and maybe even see an orthopedic doctor to determine the origin.  I have to ask this question regarding anxiety. Do you think that could play a role in this as well?  I personally commend you for your quest for health and to gain weight if you need to.  It's hard to gain or lose when our body fights us!

[MattyT123]

Thanks for your message, yeah, I experience anxiety all the time, but I experience it more when I get symptoms.  I'm on the waiting list for physiotherapist, quite difficult to see them now with Covid19 thing.