Citrus can sometimes have some varying amounts of thorns depending on the variety. If however, you have a grafted citrus tree I am guessing that you may have suckers forming from below the graft. These are very spiky/thorny and you will notice they come from quite low on the tree. They are actually from the rootstock itself.
The best thing to do is simply cut them all off at the point where they are growing, flush against the tree. You do not want the rootstock to take over. This will fix your problem and your citrus tree will then be able to put more growth into the part you want to grow.
All the best
The Palmers Team
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