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The spherical collapse model is often used to follow the evolution ofoverdensities into the nonlinear regime. We describe the correct approach to beused in coupled dark energy cosmologies, where a fifth force, different fromgravity and mediated by the dark energy scalar field, influences the collapse.We reformulate the spherical collapse description by deriving it directly fromthe set of nonlinear hydrodynamical Navier Stokes equations. By comparing withthe corresponding relativistic equations, we show how the fifth force should betaken into account within the spherical collapse picture and clarify theproblems arising when an inhomogeneous scalar field is considered within aspherical collapse picture. We then apply our method to the case of coupledquintessence, where the fifth force acts among cold dark matter particles, andto growing neutrino quintessence, where the fifth force acts between neutrinos.Furthermore, we review this method when applied to standard cosmologies andapply our analysis to minimally coupled quintessence and check past results forearly dark energy parametrizations.

Clarifying spherical collapse in coupled dark energy cosmologies