I do not load menu Ionic 3

I would like to know what I am doing wrong because when I enter 'Start' for example and load the new page, the menu does not appear again.

<ion-menu [content]="mycontent" id="main-menu">
<ion-content>
  <ion-list>
    <ion-navbar hideBackButton>
      <ion-title><ion-icon name="ionic"></ion-icon>MyGoalTracker</ion-title>
      <ion-label>{{email}}</ion-label>
    </ion-navbar>
    <ion-item (click)="abrirPagina()"><ion-icon name="home"></ion-icon>Inicio</ion-item>
    <ion-item [navPush]="DiarioPage"><ion-icon name="calendar"></ion-icon>Diario</ion-item>
    <ion-item [navPush]="InformesPage"><ion-icon name="stats"></ion-icon>Informes</ion-item>
    <ion-item [navPush]="PesoPage"><ion-icon name="disc"></ion-icon>Peso</ion-item>
  </ion-list>
</ion-content>
</ion-menu>
<ion-header>
  <ion-navbar>
  <ion-buttons left>
    <button ion-button menuToggle>
      <ion-icon name="menu"></ion-icon>
    </button>
  </ion-buttons>
    <ion-title>Inicio</ion-title>
</ion-navbar>
</ion-header>
<ion-content>
  <ion-nav #mycontent [root]="LandingPage"></ion-nav>
  ...
</ion-content>

I hope your help, thanks in advance.

Greetings.